[cm6] Tidy up advanced references search banner code (#8674)

GitOrigin-RevId: a0044b9328af03a77ac3c3e5d5caa594bbd5fe6b

services/web/frontend/stylesheets/app/editor.less

@@ -587,6 +587,18 @@ CodeMirror
   }
 }
 
+.references-search-banner {
+  position: absolute;
+  top: 8px;
+  right: 8px;
+  left: 8px;
+  z-index: 10;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 5px 10px;
+}
+
 // -- References Search Modal --
 .references-search-modal-backdrop {
   // don't grey out the editor when the