<body>
  <div class="red"></div>
  <div class="blue"></div>
  <div class="green"></div>
</body> 

.red{
  width: 30%;
  height: 40vh;
  background: red;
  position: absolute;
  z-index:1;
    }

.blue{
  background: blue;
  width: 30%;
  height: 40vh;
  position: absolute;
  top: 50px;
  left:50px;
  z-index:3;
}

.green{
  width: 30%;
  height: 50vh;
  background: green;
  position: absolute;
  left: 150px;
  top: 30px;
  z-index: 2;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.