<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS的外部样式</title>
    <!--<link rel="stylesheet" href="css/demo.css">-->
    <style>
        @import url(demo.css)
    </style>
</head>

<body>
    <h2>CSS的外部样式</h2>
    <p>用于定义HTML内容在浏览器中的显示样式</p>
</body>

</html>