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tutorial-14.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Visibility and Z-Index</title>
<style>
.box{
width: 180px;
height: 200px;
border: 2px solid black;
}
#box1{
background-color: red;
z-index: auto;
position: relative;
top: 50px;
z-index: 45;
}
#box2{
background-color: cornflowerblue;
position: relative;
z-index: -1;
top: 15px;
}
#box3{
background-color: green;
}
#box4{
background-color: violet;
}
</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>