diff --git a/theme/boost/scss/moodle/core.scss b/theme/boost/scss/moodle/core.scss
index a38d069ce7c..a31a3575505 100644
--- a/theme/boost/scss/moodle/core.scss
+++ b/theme/boost/scss/moodle/core.scss
@@ -3124,7 +3124,7 @@ 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 0a4d42811d7..8b1e31c67df 100644
--- a/theme/boost/style/moodle.css
+++ b/theme/boost/style/moodle.css
@@ -25950,7 +25950,7 @@ 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 9537095c883..c284e6e9136 100644
--- a/theme/classic/style/moodle.css
+++ b/theme/classic/style/moodle.css
@@ -25950,7 +25950,7 @@ 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 */