SOURCE

console 命令行工具 X clear

                    
>
console
<html>
    <head>
        <title>标题</title>
    </head>
    <body>
        <header>头部内容</header>
        <section>主体内容</section>
        <footer>底部内容</footer>
    </body>
</html>
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    padding: 10px;
}

html {
    background: red;
}

body {
    background: yellow;
}

header {
    background: green;
}
section{
    background: greenyellow;
}