diff --git a/theme/boost/scss/moodle/core.scss b/theme/boost/scss/moodle/core.scss
index 5f9d24b023f..ad0b3718b79 100644
--- a/theme/boost/scss/moodle/core.scss
+++ b/theme/boost/scss/moodle/core.scss
@@ -3059,7 +3059,7 @@ blockquote {
     margin: 0 0.5rem 1rem;
     padding-left: 1rem;
     color: $gray-700;
-    border-left: 5px solid $gray-400;
+    border-left: 5px solid $gray-500;
 }
 
 /* Prevent long strings exceeding page width */
diff --git a/theme/boost/style/moodle.css b/theme/boost/style/moodle.css
index 96536c54a9e..afcf557454f 100644
--- a/theme/boost/style/moodle.css
+++ b/theme/boost/style/moodle.css
@@ -25982,7 +25982,7 @@ blockquote {
   margin: 0 0.5rem 1rem;
   padding-left: 1rem;
   color: #495057;
-  border-left: 5px solid #ced4da;
+  border-left: 5px solid #8f959e;
 }
 
 /* Prevent long strings exceeding page width */
diff --git a/theme/classic/style/moodle.css b/theme/classic/style/moodle.css
index 11ce0804ce4..95d4f8b9189 100644
--- a/theme/classic/style/moodle.css
+++ b/theme/classic/style/moodle.css
@@ -25982,7 +25982,7 @@ blockquote {
   margin: 0 0.5rem 1rem;
   padding-left: 1rem;
   color: #495057;
-  border-left: 5px solid #ced4da;
+  border-left: 5px solid #8f959e;
 }
 
 /* Prevent long strings exceeding page width */