<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
-sharpdd {
width: 100%;
height: 100%;
}
-sharpdd1 {
width: 20%;
height: 20%;
background-color: -sharpF17A7A;
}
</style>
</head>
<body>
<div id="dd">
<div id="dd1">
111
222
2222
</div>
</div>
</body>
</html> dom the css style of the object inherits its parent, so the height of html,body needs to be set to 100% so that the height of div can be 100% adaptive.
html,body {
height: 100%;
width: 100%;}
-sharpdd {
width: 100vw;
height: 100vh;
}
-sharpdd1 {
width: 20vw;
height: 20vh;
background-color: -sharpF17A7A;
}you can try vh
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