修改底部按钮组件定位层级

src/web/staticres/common-module/mobile-portrayal-footer/css/mobile-portrayal-footer.css

@@ -15,7 +15,7 @@
   position: fixed;
   bottom: 0;
   left: 0;
-  z-index: 20;
+  z-index: 199;
   width: 100%;
   height: 1.06rem;
   padding-bottom: 0.1rem;