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<!DOCTYPE html>
<html>
<head>
<style>
.container {
  position: relative;
}
.black-box {
  position: relative;
  border: 2px solid black;
  height: 100px;
  margin: 30px;
}
.gray-box {
  position: absolute;
  background: lightgray;
  height: 60px;  
  width: 70%;
  left: 50px;
  top: 50px;
}
.green-box {
  position: absolute;
  background: lightgreen;
  width: 35%;
  left: 270px;
  top: -15px;
  height: 100px;
}
</style>
</head>
<body>
<h1>Overlapping elements</h1>
<p>If two positioned elements overlap each other without a z-index specified,
the element defined last in the HTML code will be shown on top:</p>
<div class="container">
  <div class="black-box">Black box</div>
  <div class="gray-box">Gray box</div>
  <div class="green-box">Green box</div>