fix(mobile): popover styles (#15351)

blocksuite/affine/components/src/toolbar/menu-button.ts

@@ -55,6 +55,7 @@ export class EditorMenuButton extends WithDisposable(LitElement) {
       },
       mainAxis: 0,
       offsetHeight: 6 * 4,
+      topLayer: true,
       ...this.popperOptions,
     });
   }
@@ -124,6 +125,14 @@ export class EditorMenuContent extends LitElement {
       outline: none;
     }
 
+    :host([popover]) {
+      inset: auto;
+      margin: 0;
+      border: 0;
+      background: transparent;
+      color: inherit;
+    }
+
     :host([data-show]) {
       display: flex;
       justify-content: center;