fix(): menu button and nav overflow

packages/core/src/components/menu-button/menu-button.tsx

@@ -40,6 +40,8 @@ export class MenuButton {
 
   componentWillLoad() {
     this.custom = this.el.childElementCount > 0;
+    const closestNav = this.el.closest('ion-nav');
+    closestNav.canGoBack() ? this.el.hidden = true : this.el.hidden = false;
   }
 
   render() {

packages/core/src/components/nav/nav.scss

@@ -9,6 +9,7 @@ ion-nav {
 
   z-index: $z-index-page-container;
 
+  overflow: hidden;
   width: 100%;
   height: 100%;