how to apply overlay property in css code example

Example 1: css overlay

#hero{
  background-image:url();
  background-size:cover;
  background-position:top center;
  position:relative;
}

#hero::after{
  content:'';
  position:absolute;
  left:0;
  top:0;
  height:100%;
  width:100%;
  background-color:black;
  opacity:0.7;
}

Example 2: overlay a box in css

<html>
  <body>
   <div class="overlay"></div>
   
  <body>
<html>

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