"Stacking context example"
Bootstrap 3.3.0 Snippet by mazinjb

<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="container"> <div id="div1"> <br /><span class="bold">DIV #1</span> <br />position: relative; <div id="div2"> <br /><span class="bold">DIV #2</span> <br />position: absolute; <br />z-index: 1; </div> </div> <br /> <div id="div3"> <br /><span class="bold">DIV #3</span> <br />position: relative; <div id="div4"> <br /><span class="bold">DIV #4</span> <br />position: absolute; <br />z-index: 2; </div> </div> </body></html> </div>
.bold { font-weight: bold; font: 12px Arial; } #div1, #div3 { height: 80px; position: relative; border: 1px dashed #669966; background-color: #ccffcc; padding-left: 5px; } #div2 { opacity: 0.8; z-index: 1; position: absolute; width: 150px; height: 200px; top: 20px; left: 170px; border: 1px dashed #990000; background-color: #ffdddd; text-align: center; } #div4 { opacity: 0.8; z-index: 2; position: absolute; width: 200px; height: 70px; top: 65px; left: 50px; border: 1px dashed #000099; background-color: #ddddff; text-align: left; padding-left: 10px; }

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