diff --git a/core/bubbles/mini_workspace_bubble.ts b/core/bubbles/mini_workspace_bubble.ts
index 74317d57bc1..d11efb2809a 100644
--- a/core/bubbles/mini_workspace_bubble.ts
+++ b/core/bubbles/mini_workspace_bubble.ts
@@ -80,6 +80,7 @@ export class MiniWorkspaceBubble extends Bubble {
       flyout?.show(options.languageTree);
     }
 
+    dom.addClass(this.svgRoot, 'blocklyMiniWorkspaceBubble');
     this.miniWorkspace.addChangeListener(this.onWorkspaceChange.bind(this));
     this.miniWorkspace
       .getFlyout()