<div class="radius"></div>
.radius{
  width:200px;
  height:150px;
  background:#333;
  border-radius: 180px 15px 100px 15px / 15px 160px 15px 185px; 
  -webkit-border-radius: 180px 15px 100px 15px / 15px 160px 15px 185px;
  -moz-border-radius: 180px 15px 100px 15px / 15px 160px 15px 185px;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.