<!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>