<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>css的外部样式</title>
    <!-- <link rel="stylesheet" href="ess/demo.css"> -->
    <style>
        @import url(demo.css)
    </style>
    </head>
    <body>
        <h2>CSS层叠样式</h2>
        <p>用于定义HTML内容在浏览器中的显示样式</p>
</body>
</html>

console 命令行工具 X clear

console