fix(sideMenu): do not let it be scrolled as part of the body

scss/_scaffolding.scss

@@ -87,7 +87,6 @@ body.grade-c {
   @include touch-callout(none);
   @include text-size-adjust(none);
   @include transform-origin(left, top);
-  -webkit-backface-visibility: hidden;
 }
 
 // Scroll bar styles
@@ -333,4 +332,5 @@ ion-infinite-scroll.active .scroll-infinite {
   width: 100%;
   height: 100%;
   background-color: $base-background-color;
+  overflow: hidden;
 }