put overlay on div css code example

Example 1: css div overlay div

#container { //goes to the bottom
  width: 100px;
  height: 100px;
  position: relative;
}
#div1{ //comes to the top
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 10;
}

Example 2: overlay a box in css

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

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