<!DOCTYPE html>
<html>
<head>
<title>My website</title>
</head>
<body>
<div style="background-color:orange;">
<h1>Heading</h1>
<p> just tagline</p>
</div>
<div>
<div style="width:25%; float:left">Sidebar</div>
<div style="width:75%;">Main</div>
</div>
</body>
</html>
