<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>flex</title>
<style>
html,body {
padding: 0;
margin: 0;
}
.container{
width: 100%;
height: 100vh;
display: flex;
}
.sidebar::before {
content: ' ';
width: 200px;
height: 100%;
}
.sidebar {
display: inherit;
background: #f5f5f5;
}
.main {
background: gray;
width: 100%;
}
</style>
</head>
<body>
<div class="container">
<div class="sidebar"></div>
<div class="main"></div>
</div>
</body>
</html>
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