overlay div on another 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: 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 3: view div over other divs

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>CSS Overlaying One DIV over Another DIV</title>
<style> 
    .container{
        width: 200px;
        height: 200px;
        position: relative;
        margin: 20px;
    }
    .box{
        width: 100%;
        height: 100%;            
        position: absolute;
        top: 0;
        left: 0;
        opacity: 0.8;  /* for demo purpose  */
    }
    .stack-top{
        z-index: 9;
        margin: 20px; /* for demo purpose  */
    }
</style>
</head>
<body>
    <div class="container">
        <div class="box" style="background: red;"></div>
        <div class="box stack-top" style="background: blue;"></div>
    </div>
</body>
</html>

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