add _override-hljs.scss

resource/styles/scss/_admin.scss

@@ -31,11 +31,6 @@
     .CodeMirror pre {
       font-family: $font-family-monospace;
     }
-
-    // override Highlight Js Style Border
-    .no-border {
-      border: none;
-    }
   }
 
   .admin-security {

resource/styles/scss/_override-hljs.scss

@@ -0,0 +1,8 @@
+.admin-page{
+  .admin-customize{
+    // override Highlight Js Style Border
+    .hljs-no-border {
+      border: none;
+    }
+  }
+}

resource/styles/scss/style.scss

@@ -8,6 +8,9 @@
 // vendor
 @import 'vendor';
 
+// override highlightJsStyle
+@import 'override-hljs';
+
 // override react-bootstrap-typeahead styles
 @import 'override-rbt';