<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.square{
padding: 50%;
position: relative;
}
.c {
position: absolute;
background: yellowgreen;
/* transform: translate3d(-50%, -50%, 0); */
left: 0;
top: 0;
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<div class="square">
<div class="c"></div>
</div>
</body>
</html>
