Nested sidebar ordering almost working

src-web/components/core/Editor/Editor.css

@@ -58,7 +58,7 @@
       -webkit-text-security: none;
 
       &.placeholder-widget-error {
-        @apply bg-red-300/40 border-red-300 border-opacity-40;
+        @apply bg-red-300/40 border-red-300/80 border-opacity-40 hover:border-red-300 hover:bg-red-300/50;
       }
     }
   }

src-web/components/core/Editor/twig/placeholder.ts

@@ -16,6 +16,7 @@ class PlaceholderWidget extends WidgetType {
     elt.className = `placeholder-widget ${
       !this.isExistingVariable ? 'placeholder-widget-error' : ''
     }`;
+    elt.title = !this.isExistingVariable ? 'Variable not found in active environment' : '';
     elt.textContent = this.name;
     return elt;
   }