<div class="demo"></div>
.demo {
  width: 100px;
  height: 100px;
  background: pink;
  outline-width: 10px;
  outline-style: solid;
  outline-color: red;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. //cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js