I can’t get this to work in jsfiddle:
https://codepen.io/oknoblich/pen/hgJFm
This is the only code I edited from the original.
.b {
position: absolute;
top: 130%;
left: 50%;
width: 170px;
height: 170px;
margin: -204px 0 0 -400px;
overflow: hidden;
}