<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{
margin: 0;
padding: 0;
}
html,body,.web{
height: 100%;
overflow: hidden;
}
.left{
width:500px;
height:100%;
background:skyblue;
float: left;
}
.right{
background:pink;
height: 100%;
}
</style>
</head>
<body>
<div class="web">
<div class="left">12345678</div>
<div class="right">2342342</div>
</div>
</body>
</html>
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