css overlay divs code example

Example 1: 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>

Example 2: overlay a box in css

html, body{
  min-height: 100%;
}
body{
  position: relative;
}
.overlay{
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  background-color: rgba(0,0,0,0.5); /*dim the background*/
}

Example 3: overlay a box in css

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

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