Edit form background color on highlighted note

Added a white background to the edit form on highlighted notes

Closes #18101

app/assets/stylesheets/pages/note_form.scss

@@ -96,17 +96,8 @@
   display: none;
   font-size: 15px;
 
-  .form-actions {
-    padding-left: 20px;
-
-    .btn-save {
-      float: left;
-    }
-
-    .note-form-option {
-      float: left;
-      padding: 2px 0 0 25px;
-    }
+  .md-area {
+    background-color: #fff;
   }
 }