Merge pull request #12356 from overleaf/revert-12354-revert-12330-jel-grid-3-and-4-col

Revert "Revert "[web] Add 3 and 4 column options to Layout | Grid on the CMS""

GitOrigin-RevId: b24230c5f4f34bf2baa01ea82d73af1346ad95c8

services/web/frontend/stylesheets/app/cms-page.less

@@ -379,3 +379,11 @@
     }
   }
 }
+
+.reverse-col-order-mobile {
+  @media (max-width: @screen-sm-min) {
+    display: flex;
+    flex-flow: column;
+    flex-direction: column-reverse;
+  }
+}