<div class="container">
</div>
.container{
  background:red;
  width:10px;
  height:10px;
  margin: 10px;
  border-radius: 5px;
  box-shadow: 200px 200px 0 5px green,
    230px 200px 0 5px green,
    215px 215px 0 -3px red;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.