css overlay over div 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: 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 3: how to put one div over another

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Web page</title>
  </head>
  <body>
    <div id="overlay">
    </div>
    <div id="originalDiv">
    </div>
  </body>
  <style>
    #overlay {
      width: 100px;
      height: 100px;
      background-color: red;
      z-index: -1;
      position:absolute;
      top:50px;
      left:50px;
    }
    
    #originalDiv {
      width: 100px;
      height: 100px;
      background-color: blue;
      z-index: 1;
      position:absolute;
      top:0px;
      left:0px;
    }
  </style>
</html>

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