css原生变量和计算 ！
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Examples</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
<style>
*{
margin: 0;
padding: 0;
}
body{
position: relative;
width: 100vw;
height: 100vh;
}
html{
--w: 30vw;
--h: 30vw;
--borderW:2px;
--colorRed:red;
}
.box{
position: absolute;
left: calc(100% / 2);
top: calc(100% / 2);
margin-top:calc(var(--w) / -2);
margin-left: calc(var(--h) / -2);
width: var(--w);
height: var(--h);
border: var(--borderW) inset var(--colorRed);
}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>
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