<code lang="html">
<!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>Title</title>
</head>
<body>
<div class="container-1">
<div class="box-1"><h3></h3></div>
<div class="box-2"><h3></h3></div>
<div class="box-3"><h3></h3></div>
</div>
<div class="container-2">
<div class="box-4"><h3></h3></div>
<div class="box-5"><h3></h3></div>
<div class="box-6"><h3></h3></div>
</div>
</body>
</html>
</code>