fix: Fix toolbar styles in markdown markup editor

client/src/components/common/MarkdownEditor/MarkdownEditor.module.scss

@@ -14,6 +14,7 @@
         background: #fff;
       }
 
+      .g-md-markup-editor__toolbar,
       .g-md-wysiwyg-editor__toolbar {
         background: #f5f6f7;
         z-index: 2000;