web-development-tutorials/tut27.html at master · chinmay021/web-development-tutorials · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Visibility and z-index</title>
    <style>
        .box{
            width: 170px;
            height: 170px;
            border: 2px solid black;
        }
        #box1{
            position: relative;
            top:49px;
            z-index: 20;
            background-color: green;
        }
        #box2{
            position: relative;
            top:14px;
            /* z-index will only work for position: absolute, relative,,fixed or sticky; */
            z-index: -16;
           /*display :none will hide the element and the space */
            /* display: none;  */
            /* visibility:hidden will hide the element but will show its empty space */
            /* visibility:hidden;  */
            background-color: red;

        }
        #box3{
            background-color: blue;
        }
        #box4{
            background-color: yellow;
        }
    </style>
</head>
<body>
    <div class="box" id="box1"></div>
    <div class="box" id="box2"></div>
    <div class="box" id="box3"></div>
    <div class="box" id="box4"></div>
</body>
</html>