<div>This is some content</div>
div{
  width:200px;
  height:100px;
  border-top:10px solid black;
  border-left:2px solid red;
  border-right:5px solid green;
  border-bottom:10px solid yellow;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.