How to achieve mobile terminal rem adaptation
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<!--follow meta code for mobile adaptation -->
<meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no" />
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
#box{
width: 7.5rem;
height: 7.5rem;
background: red;
}
</style>
</head>
<body>
<div id="box"></div>
</body>
<script type="text/javascript">
//get screen width
var width = document.documentElement.clientWidth;
//get html
var htmlNode = document.querySelector('html');
//set font size
htmlNode.style.fontSize = width/7.5 + 'px';
</script>
</html>Background image distance
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
#box{
width: 100px;
height: 200px;
background: pink;
padding: 100px;
border: 80px solid blue;
background-image: url("img/1.png");
background-repeat: no-repeat;
background-origin: content-box;
background-position: -50px 0;
}
/*Answer：130px*/
</style>
</head>
<body>
<div id="box"></div>
</body>
</html>