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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
padding: 0;
margin: 0;
box-sizing: border-box;
}
body {
width: 7.5rem;
}
.container {
position: relative;
}
.container img {
width: 100%;
display: block;
}
.btn {
position: absolute;
top: 11.3rem;
left: calc(50% + 0.15rem);
transform: translateX(-50%);
width: 3.1rem;
height: 0.85rem;
}
</style>
</head>
<body>
<div class="container">
<img src="/img/bg-img.png" alt="">
<a href="http://d.firim.info/freebuy" download="">
<div class="btn"></div>
</a>
</div>
<script>
document.documentElement.style.fontSize = document.documentElement.clientWidth / 7.5 + 'px';
</script>
</body>
</html>
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