<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
html,body{width: 100%;height: 100%;}
.c1{
/* width: 100%;
height: 100%; */
width: 446px;
height: 430px;
position: relative;
}
.c2{
width: 100%;
height: 430px;
position: relative;
}
</style>
</head>
<body>
<div class="c1"></div>
<div class="c2"></div>
</body>
</html>