External CSS

examples/csses/intro.html

<html>
<head>
<title>Text on the tab</title>
<link rel='stylesheet' href='intro.css' />
</head>
<body>
<h1>Main title: External CSS file</h1>
</body>
</html>

examples/csses/intro.css

h1 {
  font-size: 40px;
}