css div overlap code example

Example 1: 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>

Example 2: css overlapping divs

html :
<div class="imageDiv"></div>
<div class="imageDiv bottomDiv"></div>

css:
 .imageDiv
        {
            margin-left: 100px;
            background: #fff;
            display: block;
            width: 345px;
            height: 220px;
            padding: 10px;
            border-radius: 2px 2px 2px 2px;
            -webkit-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
            -moz-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
        }

.bottomDiv
        {
           position:relative;
           bottom:150px;
           left:150px;
        }

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Css Example