JSFiddle - React, Tailwind, and code Playground

by Madalina Taina

HTML

<div class="div1"></div>
<div class="div2"></div>
<div class="div3"></div>

CSS

.div1{
  border: 3px solid black; 
  outline: 6px solid blue;
  width:100px;
  height:100px;
  margin:20px;
}
.div2{
  border: 5px solid green; 
  box-shadow: 0px 0px 0px 4px #000;
  width:100px;
  height:100px;
  margin:20px;
}
.div3 {
  position: relative;
  border: 5px solid #000;
  width:100px;
  height:100px;
  margin:20px;
}
.div3:before {
  content: " ";
  position: absolute;
  border: 5px solid blue;
  z-index: -1;
  top: 5px;
  left: 5px;
  right: 5px;
  bottom: 5px;
}