remove unnecessary lines

src/client/styles/scss/theme/_apply-colors-dark.scss

@@ -52,11 +52,6 @@ textarea.form-control {
   > li > a {
     color: $color-global;
   }
-
-  .divider {
-    // FIXME:
-    // background-color: $border-color;
-  }
 }
 
 .modal {