<html>
<head>
<meta name="description" content="How to set div heights">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<div class="vh20">
Height = 20vh. This div occupies 20% of the window height. It does not depend on the parent's height. It only depends on the browser window height.
</div>
<div class="container1">
<div class="vh20">
Height = 20vh. This div also occupies 20% of the window height. It does not depend on the parent's height (which is 25vh). It only depends on the browser window.
</div>
</div>
<div class="h80">
Height = 80%, but it does not work. Percentage only works if parent height has been defined.
</div>
<div class="container2">
<div class="h80">
Height = 80%. It works because its parent element has its height set to 30vh. So, its height is 80% x 30vh = 24vh.
</div>
</div>
</body>
</html>
body>div{
margin-top: 10px;
}
.vh20 {
border: 1px solid black;
background-color: lightblue;
height: 20vh;
}
.container1 {
height: 25vh;
border: 1px solid black;
}
.container2 {
height: 30vh; /* You can use another absolute unit, like px */
border: 1px solid black;
background-color: green;
}
.h80 {
height: 80%;
border: 1px solid red;
background-color: lightgreen;
}
Output
300px
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