diff --git a/packages/wxt/src/utils/content-script-ui/shadow-root.ts b/packages/wxt/src/utils/content-script-ui/shadow-root.ts
index a0736b841..9a0376310 100644
--- a/packages/wxt/src/utils/content-script-ui/shadow-root.ts
+++ b/packages/wxt/src/utils/content-script-ui/shadow-root.ts
@@ -55,7 +55,7 @@ export async function createShadowRootUi<TMounted>(
   const mount = () => {
     // Add shadow root element to DOM
     mountUi(shadowHost, options);
-    applyPosition(shadowHost, shadow.querySelector('html'), options);
+    applyPosition(shadowHost, uiContainer, options);
 
     // Add document CSS
     if (