修改

resources/app/public/css/browser.css

@@ -535,6 +535,7 @@ webview object {
     display: none;
     min-width: 90pt;
     background: #fff;
+    z-index: 999999999;
     box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.14), 0 1px 7px 0 rgba(0, 0, 0, 0.12), 0 3px 1px -1px rgba(0, 0, 0, 0.2);
     -moz-user-select: none;
     -webkit-user-select: none;