fix footer position in zoomed display mode

src/main/frontend/mobile/index.css

@@ -186,11 +186,13 @@ html.is-native-android {
 
 html.is-zoomed-native-ios {
     .cp__footer {
-        height: 60px;
+        bottom: 70px;
+        height: 70px;
     }
     
     @media (orientation: landscape) {
         .cp__footer {
+            bottom: 50px;
             height: 50px;
         }
     }