[Bug fix] overflow: hidden on rounded Wrapper

-webkit-mask-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAA5JREFUeNpiYGBgAAgwAAAEAAGbA+oJAAAAAElFTkSuQmCC); 
or
transform: translateZ(0);

When you have a problem to hide the corner part of DOM which is inside of rounded wrapper (even though the wrapper has overflow: hidden) at old device, just put it in the wrapper.

It is the bugfix for webkit.