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>盒子模型</title>
    <style type="text/css">
        body {
            margin: 0;
            padding: 0;
    }

    #box1 {
        background-color: #9cf;
        margin: 20px;
        border: 10px solid #039;
        padding: 40px;
        width: 200px;
    }

    #text{
        background-color: #fc0;
        height: 100px;
    }

    #box2{
        background-color: #ccc;
        margin: 5px;
        height: 100px;
        padding-left: 30px;
    }
    </style>
</head>
<body>
    <div id="box1">
        <div id="text">学习CSS很重要</div>
    </div>
    <div id="box2">盒子模型需要认真理解</div>
</body>
</html>