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 re1="stylesheet" href="CSS/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>

P{
    color: blue;
}
h2{
    color: red;
}