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>