移動端レイアウトのrem+px+vw単位換算
<html>
<head>
<meta charset="UTF-8">
<title>title>
<style type="text/css">
*{margin: 0;padding: 0;}
html{
font-size:100px;
}
.box{
width: 1rem;
height: 100px;
}
style>
head>
<body>
<div class="box">div>
body>
html>