diff --git a/src/Middleware/Diagnostics/src/DeveloperExceptionPage/Views/ErrorPage.css b/src/Middleware/Diagnostics/src/DeveloperExceptionPage/Views/ErrorPage.css
index 54e66c97af..8c60d047a5 100644
--- a/src/Middleware/Diagnostics/src/DeveloperExceptionPage/Views/ErrorPage.css
+++ b/src/Middleware/Diagnostics/src/DeveloperExceptionPage/Views/ErrorPage.css
@@ -96,6 +96,12 @@ body .location {
         background-color: #fbfbfb;
     }
 
+#stackpage .frame .source .highlight {
+    border-left: 3px solid red;
+    margin-left: -3px;
+    font-weight: bold;
+}
+
 #stackpage .frame .source .highlight li span {
     color: #FF0000;
 }
diff --git a/src/Shared/ErrorPage/Views/ErrorPage.css b/src/Shared/ErrorPage/Views/ErrorPage.css
index 4d3287c12d..1b16b5792c 100644
--- a/src/Shared/ErrorPage/Views/ErrorPage.css
+++ b/src/Shared/ErrorPage/Views/ErrorPage.css
@@ -98,6 +98,12 @@ body .location {
         background-color: #fbfbfb;
     }
 
+#stackpage .frame .source .highlight {
+    border-left: 3px solid red;
+    margin-left: -3px;
+    font-weight: bold;
+}
+
 #stackpage .frame .source .highlight li span {
     color: #FF0000;
 }