diff --git a/src/ProjectTemplates/BlazorTemplates.Tests/BlazorServerTemplateTest.cs b/src/ProjectTemplates/BlazorTemplates.Tests/BlazorServerTemplateTest.cs
index 426647d481..e8893c1338 100644
--- a/src/ProjectTemplates/BlazorTemplates.Tests/BlazorServerTemplateTest.cs
+++ b/src/ProjectTemplates/BlazorTemplates.Tests/BlazorServerTemplateTest.cs
@@ -30,6 +30,9 @@ namespace Templates.Test
         [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/20172")]
         public async Task BlazorServerTemplateWorks_NoAuth()
         {
+            // Additional arguments are needed. See: https://github.com/dotnet/aspnetcore/issues/24278
+            Environment.SetEnvironmentVariable("EnableDefaultScopedCssItems", "true");
+
             Project = await ProjectFactory.GetOrCreateProject("blazorservernoauth", Output);
 
             var createResult = await Project.RunDotNetNewAsync("blazorserver");
@@ -88,6 +91,9 @@ namespace Templates.Test
         [QuarantinedTest]
         public async Task BlazorServerTemplateWorks_IndividualAuth(bool useLocalDB)
         {
+            // Additional arguments are needed. See: https://github.com/dotnet/aspnetcore/issues/24278
+            Environment.SetEnvironmentVariable("EnableDefaultScopedCssItems", "true");
+
             Project = await ProjectFactory.GetOrCreateProject("blazorserverindividual" + (useLocalDB ? "uld" : ""), Output);
 
             var createResult = await Project.RunDotNetNewAsync("blazorserver", auth: "Individual", useLocalDB: useLocalDB);
diff --git a/src/ProjectTemplates/BlazorTemplates.Tests/BlazorWasmTemplateTest.cs b/src/ProjectTemplates/BlazorTemplates.Tests/BlazorWasmTemplateTest.cs
index decd986856..f6f5cea506 100644
--- a/src/ProjectTemplates/BlazorTemplates.Tests/BlazorWasmTemplateTest.cs
+++ b/src/ProjectTemplates/BlazorTemplates.Tests/BlazorWasmTemplateTest.cs
@@ -43,6 +43,9 @@ namespace Templates.Test
         [Fact]
         public async Task BlazorWasmStandaloneTemplate_Works()
         {
+            // Additional arguments are needed. See: https://github.com/dotnet/aspnetcore/issues/24278
+            Environment.SetEnvironmentVariable("EnableDefaultScopedCssItems", "true");
+
             var project = await ProjectFactory.GetOrCreateProject("blazorstandalone", Output);
             project.RuntimeIdentifier = "browser-wasm";
 
@@ -81,6 +84,9 @@ namespace Templates.Test
         [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/20172")]
         public async Task BlazorWasmHostedTemplate_Works()
         {
+            // Additional arguments are needed. See: https://github.com/dotnet/aspnetcore/issues/24278
+            Environment.SetEnvironmentVariable("EnableDefaultScopedCssItems", "true");
+
             var project = await ProjectFactory.GetOrCreateProject("blazorhosted", Output);
 
             var createResult = await project.RunDotNetNewAsync("blazorwasm", args: new[] { "--hosted" });
@@ -134,6 +140,9 @@ namespace Templates.Test
         [Fact]
         public async Task BlazorWasmStandalonePwaTemplate_Works()
         {
+            // Additional arguments are needed. See: https://github.com/dotnet/aspnetcore/issues/24278
+            Environment.SetEnvironmentVariable("EnableDefaultScopedCssItems", "true");
+
             var project = await ProjectFactory.GetOrCreateProject("blazorstandalonepwa", Output);
             project.RuntimeIdentifier = "browser-wasm";
 
@@ -173,6 +182,9 @@ namespace Templates.Test
         [Fact]
         public async Task BlazorWasmHostedPwaTemplate_Works()
         {
+            // Additional arguments are needed. See: https://github.com/dotnet/aspnetcore/issues/24278
+            Environment.SetEnvironmentVariable("EnableDefaultScopedCssItems", "true");
+
             var project = await ProjectFactory.GetOrCreateProject("blazorhostedpwa", Output);
 
             var createResult = await project.RunDotNetNewAsync("blazorwasm", args: new[] { "--hosted", "--pwa" });
@@ -266,6 +278,9 @@ namespace Templates.Test
 
         private async Task BlazorWasmHostedTemplate_IndividualAuth_Works(bool useLocalDb)
         {
+            // Additional arguments are needed. See: https://github.com/dotnet/aspnetcore/issues/24278
+            Environment.SetEnvironmentVariable("EnableDefaultScopedCssItems", "true");
+
             var project = await ProjectFactory.GetOrCreateProject("blazorhostedindividual" + (useLocalDb ? "uld" : ""), Output);
 
             var createResult = await project.RunDotNetNewAsync("blazorwasm", args: new[] { "--hosted", "-au", "Individual", useLocalDb ? "-uld" : "" });
@@ -333,6 +348,9 @@ namespace Templates.Test
         [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/23639")]
         public async Task BlazorWasmStandaloneTemplate_IndividualAuth_Works()
         {
+            // Additional arguments are needed. See: https://github.com/dotnet/aspnetcore/issues/24278
+            Environment.SetEnvironmentVariable("EnableDefaultScopedCssItems", "true");
+
             var project = await ProjectFactory.GetOrCreateProject("blazorstandaloneindividual", Output);
             project.RuntimeIdentifier = "browser-wasm";
 
diff --git a/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Pages/_Host.cshtml b/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Pages/_Host.cshtml
index 767bcb005f..f32e81bd40 100644
--- a/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Pages/_Host.cshtml
+++ b/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Pages/_Host.cshtml
@@ -14,11 +14,10 @@
     <base href="~/" />
     <link rel="stylesheet" href="css/bootstrap/bootstrap.min.css" />
     <link href="css/site.css" rel="stylesheet" />
+    <link href="_content/BlazorServerWeb-CSharp/_framework/scoped.styles.css" rel="stylesheet" />
 </head>
 <body>
-    <app>
-        <component type="typeof(App)" render-mode="ServerPrerendered" />
-    </app>
+    <component type="typeof(App)" render-mode="ServerPrerendered" />
 
     <div id="blazor-error-ui">
         <environment include="Staging,Production">
diff --git a/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/MainLayout.Auth.razor b/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/MainLayout.Auth.razor
index fafa2f55f1..a6763b9aaa 100644
--- a/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/MainLayout.Auth.razor
+++ b/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/MainLayout.Auth.razor
@@ -1,16 +1,18 @@
 @inherits LayoutComponentBase
 
-<div class="sidebar">
-    <NavMenu />
-</div>
-
-<div class="main">
-    <div class="top-row px-4 auth">
-        <LoginDisplay />
-        <a href="https://docs.microsoft.com/aspnet/" target="_blank">About</a>
+<div class="page">
+    <div class="sidebar">
+        <NavMenu />
     </div>
 
-    <div class="content px-4">
-        @Body
+    <div class="main">
+        <div class="top-row px-4 auth">
+            <LoginDisplay />
+            <a href="https://docs.microsoft.com/aspnet/" target="_blank">About</a>
+        </div>
+
+        <div class="content px-4">
+            @Body
+        </div>
     </div>
 </div>
diff --git a/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/MainLayout.NoAuth.razor b/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/MainLayout.NoAuth.razor
index 74820a0b75..2281c4f783 100644
--- a/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/MainLayout.NoAuth.razor
+++ b/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/MainLayout.NoAuth.razor
@@ -1,15 +1,17 @@
 @inherits LayoutComponentBase
 
-<div class="sidebar">
-    <NavMenu />
-</div>
-
-<div class="main">
-    <div class="top-row px-4">
-        <a href="https://docs.microsoft.com/aspnet/" target="_blank">About</a>
+<div class="page">
+    <div class="sidebar">
+        <NavMenu />
     </div>
 
-    <div class="content px-4">
-        @Body
+    <div class="main">
+        <div class="top-row px-4">
+            <a href="https://docs.microsoft.com/aspnet/" target="_blank">About</a>
+        </div>
+
+        <div class="content px-4">
+            @Body
+        </div>
     </div>
 </div>
diff --git a/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/MainLayout.razor.css b/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/MainLayout.razor.css
new file mode 100644
index 0000000000..61a993539a
--- /dev/null
+++ b/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/MainLayout.razor.css
@@ -0,0 +1,70 @@
+.page {
+    position: relative;
+    display: flex;
+    flex-direction: column;
+}
+
+.main {
+    flex: 1;
+}
+
+.sidebar {
+    background-image: linear-gradient(180deg, rgb(5, 39, 103) 0%, #3a0647 70%);
+}
+
+.top-row {
+    background-color: #f7f7f7;
+    border-bottom: 1px solid #d6d5d5;
+    justify-content: flex-end;
+    height: 3.5rem;
+    display: flex;
+    align-items: center;
+}
+
+    .top-row ::deep a, .top-row .btn-link {
+        white-space: nowrap;
+        margin-left: 1.5rem;
+    }
+
+    .top-row a:first-child {
+        overflow: hidden;
+        text-overflow: ellipsis;
+    }
+
+@media (max-width: 767.98px) {
+    .top-row:not(.auth) {
+        display: none;
+    }
+
+    .top-row.auth {
+        justify-content: space-between;
+    }
+
+    .top-row a, .top-row .btn-link {
+        margin-left: 0;
+    }
+}
+
+@media (min-width: 768px) {
+    .page {
+        flex-direction: row;
+    }
+
+    .sidebar {
+        width: 250px;
+        height: 100vh;
+        position: sticky;
+        top: 0;
+    }
+
+    .top-row {
+        position: sticky;
+        top: 0;
+        z-index: 1;
+    }
+
+    .main > div {
+        padding-left: 2rem !important;
+        padding-right: 1.5rem !important;
+    }
+}
diff --git a/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/NavMenu.razor.css b/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/NavMenu.razor.css
new file mode 100644
index 0000000000..622671ec4c
--- /dev/null
+++ b/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Shared/NavMenu.razor.css
@@ -0,0 +1,62 @@
+.navbar-toggler {
+    background-color: rgba(255, 255, 255, 0.1);
+}
+
+.top-row {
+    height: 3.5rem;
+    background-color: rgba(0,0,0,0.4);
+}
+
+.navbar-brand {
+    font-size: 1.1rem;
+}
+
+.oi {
+    width: 2rem;
+    font-size: 1.1rem;
+    vertical-align: text-top;
+    top: -2px;
+}
+
+.nav-item {
+    font-size: 0.9rem;
+    padding-bottom: 0.5rem;
+}
+
+    .nav-item:first-of-type {
+        padding-top: 1rem;
+    }
+
+    .nav-item:last-of-type {
+        padding-bottom: 1rem;
+    }
+
+    .nav-item ::deep a {
+        color: #d7d7d7;
+        border-radius: 4px;
+        height: 3rem;
+        display: flex;
+        align-items: center;
+        line-height: 3rem;
+    }
+
+.nav-item ::deep a.active {
+    background-color: rgba(255,255,255,0.25);
+    color: white;
+}
+
+.nav-item ::deep a:hover {
+    background-color: rgba(255,255,255,0.1);
+    color: white;
+}
+
+@media (min-width: 768px) {
+    .navbar-toggler {
+        display: none;
+    }
+
+    .collapse {
+        /* Never collapse the sidebar for wide screens */
+        display: block;
+    }
+}
diff --git a/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/wwwroot/css/site.css b/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/wwwroot/css/site.css
index 2ebdff93e6..caebf2a463 100644
--- a/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/wwwroot/css/site.css
+++ b/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/wwwroot/css/site.css
@@ -14,97 +14,10 @@ a, .btn-link {
     border-color: #1861ac;
 }
 
-app {
-    position: relative;
-    display: flex;
-    flex-direction: column;
-}
-
-.top-row {
-    height: 3.5rem;
-    display: flex;
-    align-items: center;
-}
-
-.main {
-    flex: 1;
-}
-
-    .main .top-row {
-        background-color: #f7f7f7;
-        border-bottom: 1px solid #d6d5d5;
-        justify-content: flex-end;
-    }
-
-        .main .top-row > a, .main .top-row .btn-link {
-            white-space: nowrap;
-            margin-left: 1.5rem;
-        }
-
-.main .top-row a:first-child {
-    overflow: hidden;
-    text-overflow: ellipsis;
-}
-
-.sidebar {
-    background-image: linear-gradient(180deg, rgb(5, 39, 103) 0%, #3a0647 70%);
-}
-
-    .sidebar .top-row {
-        background-color: rgba(0,0,0,0.4);
-    }
-
-    .sidebar .navbar-brand {
-        font-size: 1.1rem;
-    }
-
-    .sidebar .oi {
-        width: 2rem;
-        font-size: 1.1rem;
-        vertical-align: text-top;
-        top: -2px;
-    }
-
-    .sidebar .nav-item {
-        font-size: 0.9rem;
-        padding-bottom: 0.5rem;
-    }
-
-        .sidebar .nav-item:first-of-type {
-            padding-top: 1rem;
-        }
-
-        .sidebar .nav-item:last-of-type {
-            padding-bottom: 1rem;
-        }
-
-        .sidebar .nav-item a {
-            color: #d7d7d7;
-            border-radius: 4px;
-            height: 3rem;
-            display: flex;
-            align-items: center;
-            line-height: 3rem;
-        }
-
-            .sidebar .nav-item a.active {
-                background-color: rgba(255,255,255,0.25);
-                color: white;
-            }
-
-            .sidebar .nav-item a:hover {
-                background-color: rgba(255,255,255,0.1);
-                color: white;
-            }
-
 .content {
     padding-top: 1.1rem;
 }
 
-.navbar-toggler {
-    background-color: rgba(255, 255, 255, 0.1);
-}
-
 .valid.modified:not([type=checkbox]) {
     outline: 1px solid #26b050;
 }
@@ -135,50 +48,3 @@ app {
         right: 0.75rem;
         top: 0.5rem;
     }
-
-@media (max-width: 767.98px) {
-    .main .top-row:not(.auth) {
-        display: none;
-    }
-
-    .main .top-row.auth {
-        justify-content: space-between;
-    }
-
-    .main .top-row a, .main .top-row .btn-link {
-        margin-left: 0;
-    }
-}
-
-@media (min-width: 768px) {
-    app {
-        flex-direction: row;
-    }
-
-    .sidebar {
-        width: 250px;
-        height: 100vh;
-        position: sticky;
-        top: 0;
-    }
-
-    .main .top-row {
-        position: sticky;
-        top: 0;
-        z-index: 1;
-    }
-
-    .main > div {
-        padding-left: 2rem !important;
-        padding-right: 1.5rem !important;
-    }
-
-    .navbar-toggler {
-        display: none;
-    }
-
-    .sidebar .collapse {
-        /* Never collapse the sidebar for wide screens */
-        display: block;
-    }
-}
diff --git a/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Program.cs b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Program.cs
index 02dac7f0d3..8d71e2bf47 100644
--- a/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Program.cs
+++ b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Program.cs
@@ -22,7 +22,7 @@ namespace ComponentsWebAssembly_CSharp
         public static async Task Main(string[] args)
         {
             var builder = WebAssemblyHostBuilder.CreateDefault(args);
-            builder.RootComponents.Add<App>("app");
+            builder.RootComponents.Add<App>("#app");
 
 #if (!Hosted || NoAuth)
             builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });
diff --git a/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/MainLayout.Auth.razor b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/MainLayout.Auth.razor
index fafa2f55f1..a6763b9aaa 100644
--- a/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/MainLayout.Auth.razor
+++ b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/MainLayout.Auth.razor
@@ -1,16 +1,18 @@
 @inherits LayoutComponentBase
 
-<div class="sidebar">
-    <NavMenu />
-</div>
-
-<div class="main">
-    <div class="top-row px-4 auth">
-        <LoginDisplay />
-        <a href="https://docs.microsoft.com/aspnet/" target="_blank">About</a>
+<div class="page">
+    <div class="sidebar">
+        <NavMenu />
     </div>
 
-    <div class="content px-4">
-        @Body
+    <div class="main">
+        <div class="top-row px-4 auth">
+            <LoginDisplay />
+            <a href="https://docs.microsoft.com/aspnet/" target="_blank">About</a>
+        </div>
+
+        <div class="content px-4">
+            @Body
+        </div>
     </div>
 </div>
diff --git a/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/MainLayout.NoAuth.razor b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/MainLayout.NoAuth.razor
index 0f4e22a943..b416cb9569 100644
--- a/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/MainLayout.NoAuth.razor
+++ b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/MainLayout.NoAuth.razor
@@ -1,15 +1,17 @@
 @inherits LayoutComponentBase
 
-<div class="sidebar">
-    <NavMenu />
-</div>
-
-<div class="main">
-    <div class="top-row px-4">
-        <a href="http://blazor.net" target="_blank" class="ml-md-auto">About</a>
+<div class="page">
+    <div class="sidebar">
+        <NavMenu />
     </div>
 
-    <div class="content px-4">
-        @Body
+    <div class="main">
+        <div class="top-row px-4">
+            <a href="http://blazor.net" target="_blank" class="ml-md-auto">About</a>
+        </div>
+
+        <div class="content px-4">
+            @Body
+        </div>
     </div>
 </div>
diff --git a/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/MainLayout.razor.css b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/MainLayout.razor.css
new file mode 100644
index 0000000000..61a993539a
--- /dev/null
+++ b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/MainLayout.razor.css
@@ -0,0 +1,70 @@
+.page {
+    position: relative;
+    display: flex;
+    flex-direction: column;
+}
+
+.main {
+    flex: 1;
+}
+
+.sidebar {
+    background-image: linear-gradient(180deg, rgb(5, 39, 103) 0%, #3a0647 70%);
+}
+
+.top-row {
+    background-color: #f7f7f7;
+    border-bottom: 1px solid #d6d5d5;
+    justify-content: flex-end;
+    height: 3.5rem;
+    display: flex;
+    align-items: center;
+}
+
+    .top-row ::deep a, .top-row .btn-link {
+        white-space: nowrap;
+        margin-left: 1.5rem;
+    }
+
+    .top-row a:first-child {
+        overflow: hidden;
+        text-overflow: ellipsis;
+    }
+
+@media (max-width: 767.98px) {
+    .top-row:not(.auth) {
+        display: none;
+    }
+
+    .top-row.auth {
+        justify-content: space-between;
+    }
+
+    .top-row a, .top-row .btn-link {
+        margin-left: 0;
+    }
+}
+
+@media (min-width: 768px) {
+    .page {
+        flex-direction: row;
+    }
+
+    .sidebar {
+        width: 250px;
+        height: 100vh;
+        position: sticky;
+        top: 0;
+    }
+
+    .top-row {
+        position: sticky;
+        top: 0;
+        z-index: 1;
+    }
+
+    .main > div {
+        padding-left: 2rem !important;
+        padding-right: 1.5rem !important;
+    }
+}
diff --git a/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/NavMenu.razor.css b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/NavMenu.razor.css
new file mode 100644
index 0000000000..622671ec4c
--- /dev/null
+++ b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Shared/NavMenu.razor.css
@@ -0,0 +1,62 @@
+.navbar-toggler {
+    background-color: rgba(255, 255, 255, 0.1);
+}
+
+.top-row {
+    height: 3.5rem;
+    background-color: rgba(0,0,0,0.4);
+}
+
+.navbar-brand {
+    font-size: 1.1rem;
+}
+
+.oi {
+    width: 2rem;
+    font-size: 1.1rem;
+    vertical-align: text-top;
+    top: -2px;
+}
+
+.nav-item {
+    font-size: 0.9rem;
+    padding-bottom: 0.5rem;
+}
+
+    .nav-item:first-of-type {
+        padding-top: 1rem;
+    }
+
+    .nav-item:last-of-type {
+        padding-bottom: 1rem;
+    }
+
+    .nav-item ::deep a {
+        color: #d7d7d7;
+        border-radius: 4px;
+        height: 3rem;
+        display: flex;
+        align-items: center;
+        line-height: 3rem;
+    }
+
+.nav-item ::deep a.active {
+    background-color: rgba(255,255,255,0.25);
+    color: white;
+}
+
+.nav-item ::deep a:hover {
+    background-color: rgba(255,255,255,0.1);
+    color: white;
+}
+
+@media (min-width: 768px) {
+    .navbar-toggler {
+        display: none;
+    }
+
+    .collapse {
+        /* Never collapse the sidebar for wide screens */
+        display: block;
+    }
+}
diff --git a/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/wwwroot/css/app.css b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/wwwroot/css/app.css
index 0c0c94d820..82fc22a393 100644
--- a/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/wwwroot/css/app.css
+++ b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/wwwroot/css/app.css
@@ -14,97 +14,10 @@ a, .btn-link {
     border-color: #1861ac;
 }
 
-app {
-    position: relative;
-    display: flex;
-    flex-direction: column;
-}
-
-.top-row {
-    height: 3.5rem;
-    display: flex;
-    align-items: center;
-}
-
-.main {
-    flex: 1;
-}
-
-    .main .top-row {
-        background-color: #f7f7f7;
-        border-bottom: 1px solid #d6d5d5;
-        justify-content: flex-end;
-    }
-
-        .main .top-row > a, .main .top-row .btn-link {
-            white-space: nowrap;
-            margin-left: 1.5rem;
-        }
-
-.main .top-row a:first-child {
-    overflow: hidden;
-    text-overflow: ellipsis;
-}
-
-.sidebar {
-    background-image: linear-gradient(180deg, rgb(5, 39, 103) 0%, #3a0647 70%);
-}
-
-    .sidebar .top-row {
-        background-color: rgba(0,0,0,0.4);
-    }
-
-    .sidebar .navbar-brand {
-        font-size: 1.1rem;
-    }
-
-    .sidebar .oi {
-        width: 2rem;
-        font-size: 1.1rem;
-        vertical-align: text-top;
-        top: -2px;
-    }
-
-    .sidebar .nav-item {
-        font-size: 0.9rem;
-        padding-bottom: 0.5rem;
-    }
-
-        .sidebar .nav-item:first-of-type {
-            padding-top: 1rem;
-        }
-
-        .sidebar .nav-item:last-of-type {
-            padding-bottom: 1rem;
-        }
-
-        .sidebar .nav-item a {
-            color: #d7d7d7;
-            border-radius: 4px;
-            height: 3rem;
-            display: flex;
-            align-items: center;
-            line-height: 3rem;
-        }
-
-            .sidebar .nav-item a.active {
-                background-color: rgba(255,255,255,0.25);
-                color: white;
-            }
-
-            .sidebar .nav-item a:hover {
-                background-color: rgba(255,255,255,0.1);
-                color: white;
-            }
-
 .content {
     padding-top: 1.1rem;
 }
 
-.navbar-toggler {
-    background-color: rgba(255, 255, 255, 0.1);
-}
-
 .valid.modified:not([type=checkbox]) {
     outline: 1px solid #26b050;
 }
@@ -129,56 +42,9 @@ app {
     z-index: 1000;
 }
 
-#blazor-error-ui .dismiss {
-    cursor: pointer;
-    position: absolute;
-    right: 0.75rem;
-    top: 0.5rem;
-}
-
-@media (max-width: 767.98px) {
-    .main .top-row:not(.auth) {
-        display: none;
+    #blazor-error-ui .dismiss {
+        cursor: pointer;
+        position: absolute;
+        right: 0.75rem;
+        top: 0.5rem;
     }
-
-    .main .top-row.auth {
-        justify-content: space-between;
-    }
-
-    .main .top-row a, .main .top-row .btn-link {
-        margin-left: 0;
-    }
-}
-
-@media (min-width: 768px) {
-    app {
-        flex-direction: row;
-    }
-
-    .sidebar {
-        width: 250px;
-        height: 100vh;
-        position: sticky;
-        top: 0;
-    }
-
-    .main .top-row {
-        position: sticky;
-        top: 0;
-        z-index: 1;
-    }
-
-    .main > div {
-        padding-left: 2rem !important;
-        padding-right: 1.5rem !important;
-    }
-
-    .navbar-toggler {
-        display: none;
-    }
-
-    .sidebar .collapse {
-        /* Never collapse the sidebar for wide screens */
-        display: block;
-    }
-}
diff --git a/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/wwwroot/index.html b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/wwwroot/index.html
index 7e39788a58..d29be69aff 100644
--- a/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/wwwroot/index.html
+++ b/src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/wwwroot/index.html
@@ -8,6 +8,7 @@
     <base href="/" />
     <link href="css/bootstrap/bootstrap.min.css" rel="stylesheet" />
     <link href="css/app.css" rel="stylesheet" />
+    <link href="_framework/scoped.styles.css" rel="stylesheet" />
     <!--#if PWA -->
     <link href="manifest.json" rel="manifest" />
     <link rel="apple-touch-icon" sizes="512x512" href="icon-512.png" />
@@ -15,7 +16,7 @@
 </head>
 
 <body>
-    <app>Loading...</app>
+    <div id="app">Loading...</div>
 
     <div id="blazor-error-ui">
         An unhandled error has occurred.
diff --git a/src/ProjectTemplates/test/Infrastructure/TemplateTests.props.in b/src/ProjectTemplates/test/Infrastructure/TemplateTests.props.in
index c3e1a9634d..be883d274c 100644
--- a/src/ProjectTemplates/test/Infrastructure/TemplateTests.props.in
+++ b/src/ProjectTemplates/test/Infrastructure/TemplateTests.props.in
@@ -2,7 +2,6 @@
   <PropertyGroup>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <RestoreAdditionalProjectSources>${RestoreAdditionalProjectSources}</RestoreAdditionalProjectSources>
-
     <!-- This sets an option which prevents the tests from rolling forward into a newer shared framework. -->
     <UserRuntimeConfig>$(MSBuildThisFileDirectory)runtimeconfig.norollforward.json</UserRuntimeConfig>
   </PropertyGroup>
diff --git a/src/ProjectTemplates/test/template-baselines.json b/src/ProjectTemplates/test/template-baselines.json
index bf2f88c6a7..e77037842c 100644
--- a/src/ProjectTemplates/test/template-baselines.json
+++ b/src/ProjectTemplates/test/template-baselines.json
@@ -921,7 +921,9 @@
         "Properties/launchSettings.json",
         "Shared/LoginDisplay.razor",
         "Shared/MainLayout.razor",
+        "Shared/MainLayout.razor.css",
         "Shared/NavMenu.razor",
+        "Shared/NavMenu.razor.css",
         "Shared/SurveyPrompt.razor",
         "wwwroot/favicon.ico",
         "wwwroot/css/site.css",
@@ -958,7 +960,9 @@
         "Properties/launchSettings.json",
         "Shared/LoginDisplay.razor",
         "Shared/MainLayout.razor",
+        "Shared/MainLayout.razor.css",
         "Shared/NavMenu.razor",
+        "Shared/NavMenu.razor.css",
         "Shared/SurveyPrompt.razor",
         "wwwroot/favicon.ico",
         "wwwroot/css/site.css",
@@ -995,7 +999,9 @@
         "Properties/launchSettings.json",
         "Shared/LoginDisplay.razor",
         "Shared/MainLayout.razor",
+        "Shared/MainLayout.razor.css",
         "Shared/NavMenu.razor",
+        "Shared/NavMenu.razor.css",
         "Shared/SurveyPrompt.razor",
         "wwwroot/favicon.ico",
         "wwwroot/css/site.css",
@@ -1031,7 +1037,9 @@
         "Pages/_Host.cshtml",
         "Properties/launchSettings.json",
         "Shared/MainLayout.razor",
+        "Shared/MainLayout.razor.css",
         "Shared/NavMenu.razor",
+        "Shared/NavMenu.razor.css",
         "Shared/SurveyPrompt.razor",
         "wwwroot/favicon.ico",
         "wwwroot/css/site.css",
@@ -1068,7 +1076,9 @@
         "Properties/launchSettings.json",
         "Shared/LoginDisplay.razor",
         "Shared/MainLayout.razor",
+        "Shared/MainLayout.razor.css",
         "Shared/NavMenu.razor",
+        "Shared/NavMenu.razor.css",
         "Shared/SurveyPrompt.razor",
         "wwwroot/favicon.ico",
         "wwwroot/css/site.css",
@@ -1105,7 +1115,9 @@
         "Properties/launchSettings.json",
         "Shared/LoginDisplay.razor",
         "Shared/MainLayout.razor",
+        "Shared/MainLayout.razor.css",
         "Shared/NavMenu.razor",
+        "Shared/NavMenu.razor.css",
         "Shared/SurveyPrompt.razor",
         "wwwroot/favicon.ico",
         "wwwroot/css/site.css",
diff --git a/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.ScopedCss.targets b/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.ScopedCss.targets
index 5a20c17ad1..379958af80 100644
--- a/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.ScopedCss.targets
+++ b/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.ScopedCss.targets
@@ -58,6 +58,7 @@ Integration with static web assets:
   <_ScopedCssExtension>.rz.scp.css</_ScopedCssExtension>
   <ResolveStaticWebAssetsInputsDependsOn>$(ResolveStaticWebAssetsInputsDependsOn);_CollectAllScopedCssAssets;AddScopedCssBundle</ResolveStaticWebAssetsInputsDependsOn>
   <ResolveCurrentProjectStaticWebAssetsInputsDependsOn>$(ResolveCurrentProjectStaticWebAssetsInputsDependsOn);_AddGeneratedScopedCssFiles</ResolveCurrentProjectStaticWebAssetsInputsDependsOn>
+  <GetCurrentProjectStaticWebAssetsDependsOn Condition="'$(UseBlazorWebAssembly)' == 'true'">$(GetCurrentProjectStaticWebAssetsDependsOn);IncludeScopedCssBundle;</GetCurrentProjectStaticWebAssetsDependsOn>
 </PropertyGroup>
 
 <Target Name="ResolveScopedCssInputs">
@@ -68,7 +69,7 @@ Integration with static web assets:
   NOTE: This target is called as part of an incremental build scenario in VS. Do not perform any work
   outside of calculating RazorComponent items in this target.
   -->
-  <DiscoverDefaultScopedCssItems Condition="'$(EnableDefaultScopedCssItems)'=='true'" Content="@(None);@(Content)">
+  <DiscoverDefaultScopedCssItems Condition="'$(EnableDefaultScopedCssItems)' == 'true'" Content="@(None);@(Content)">
     <Output TaskParameter="DiscoveredScopedCssInputs" ItemName="_DiscoveredScopedCssInputs" />
   </DiscoverDefaultScopedCssItems>
 
@@ -207,6 +208,33 @@ Integration with static web assets:
   </ItemGroup>
 </Target>
 
+<Target Name="IncludeScopedCssBundle" Condition="'$(ScopedCssDisableBundling)' != 'true'" DependsOnTargets="_CollectAllScopedCssAssets;_AddGeneratedScopedCssFiles">
+  <PropertyGroup>
+    <_ScopedCssOutputPath>$(_ScopedCssIntermediatePath)_framework\scoped.styles.css</_ScopedCssOutputPath>
+    <_ScopedCssOutputFullPath>$([System.IO.Path]::Combine('$(MSBuildProjectFileDirectory)', '$(_ScopedCssIntermediatePath)_framework\scoped.styles.css'))</_ScopedCssOutputFullPath>
+  </PropertyGroup>
+  <ItemGroup>
+  <!-- When bundling is enabled we want to remove all identified generated scoped css files from the list of static web assets so that
+       they are not copied to the output folder. -->
+    <StaticWebAsset Remove="@(_AllScopedCss)" Condition="'$(ScopedCssDisableBundling)' != 'true'" />
+    <!-- https://github.com/dotnet/aspnetcore/issues/24245 -->
+    <StaticWebAsset Include="$(_ScopedCssOutputPath)" Condition="@(_AllScopedCss) != ''">
+      <SourceType></SourceType>
+      <SourceId>$(PackageId)</SourceId>
+      <ContentRoot>$(_ScopedCssIntermediatePath)</ContentRoot>
+      <BasePath>$(StaticWebAssetBasePath)</BasePath>
+      <RelativePath>_framework/scoped.styles.css</RelativePath>
+    </StaticWebAsset>
+    <_ExternalStaticWebAsset Include="$(_ScopedCssOutputPath)" Condition="@(_AllScopedCss) != ''">
+      <SourceType>generated</SourceType>
+      <SourceId>$(PackageId)</SourceId>
+      <ContentRoot>$(_ScopedCssIntermediatePath)</ContentRoot>
+      <BasePath>$(StaticWebAssetBasePath)</BasePath>
+      <RelativePath>_framework/scoped.styles.css</RelativePath>
+    </_ExternalStaticWebAsset>
+  </ItemGroup>
+</Target>
+
 <Target Name="BundleScopedCssFiles" Condition="'$(ScopedCssDisableBundling)' != 'true' and '@(_AllScopedCss)' != ''" BeforeTargets="GetCopyToOutputDirectoryItems;_StaticWebAssetsComputeFilesToPublish" DependsOnTargets="_GenerateScopedCssFiles">
   <!-- Incrementalism is built into the task itself. -->
   <ConcatenateCssFiles FilesToProcess="@(_AllScopedCss)" OutputFile="$(_ScopedCssOutputPath)" />