the code is as follows:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
-sharpfather {
width: 400px;
height: 200px;
border: 1px solid -sharp000;
}
-sharpson {
width: 100%;
height: 100%;
background: pink;
margin: 0 100px;
}
</style>
</head>
<body>
<div id="father">
<div id="son"></div>
</div>
</body>
</html>the effect is as follows:
set div is not reflected. What is the reason?
