fix: use uiContainer to apply position when creating shadow root ui

Companion PR for aklinker1/webext-core#118

Author: namuorg

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 (