console 命令行工具 X clear

console

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>css的外部样式</title>
    <!--<link rel="stylesheet"=css/demo.css">-->
    <style>
        @impot url(demo.css)
    </style>
</head>
<body>
    <h2>css的叠层模式</h2>
    <p>用于定义HTML内容在浏览器中显示样式</p>
</body>
</html>

h2 {
    color:red;
}

p{
    color:blue
}