<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
<!--<link rel="stylesheet" href="main.css">-->
<style>
.layout .sidebar { float: left; 150px; background: #fce3c5; height: 300px; }
.layout .primary { margin-left: 170px; background: #fce3c5; height: 300px; }
</style>
</head>
<body>
<div class="box bg layout clearfix">
<div class="sidebar">AAA</div>
<div class="primary">BBB</div>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
<!--<link rel="stylesheet" href="main.css">-->
<style>
.layout .sidebar { float: left; 150px; background: #fce3c5; height: 300px; }
.layout .primary { margin-left: 170px; background: #fce3c5; height: 300px; }
</style>
</head>
<body>
<div class="box bg layout clearfix">
<div class="sidebar">AAA</div>
<div class="primary">BBB</div>
</div>
</body>
</html>