console 命令行工具 X clear

console

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="3.css">
</head>
<body>

    <header class="header">header</header>
    <main class="m1">
          <article class="article">...</article>
          <nav class="nav">...</nav>
          <aside class="aside">...</aside>
    </main>
    <footer class="footer">footer</footer>

    
</body>
</html>

.header {
    width: 100%;
    height: 100px;
    background-color: aqua;
}

.m1 {
    width: 100%;
    height: 800px;
    background-color: rgb(3, 59, 57);
    display: inline-block;
}

.nav {
    width: 200px;
    height: 100%;
    float: left;
    background-color: rgb(118, 219, 36);
}

.article {
    position: absolute;
    height: 800px;
    left: 200px;
    right: 200px;
    background-color: coral;
}

.aside {
    width: 200px;
    height: 100%;
    float: right;
    background-color: gold;

}

.footer {
    width: 100%;
    height: 100px;
    background-color: blueviolet;
}