app/templates/layout.mustache
<!DOCTYPE html>
<html lang="en">
<head>
<title>Watchdog</title>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<link rel="stylesheet" href="/watchdog.css" type="text/css" />
</head>
<body>
<div id="main">
<h1><a href="/">Watchdog</a></h1>
{{{yield}}}
</div>
</body>
</html>