level 1
机械之岚
楼主
<!DOCTYPE html><html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div style="width: 800px;height: 500px;border: 2px solid red;margin: 0 auto;">
<div style="width: 300px;height: 50px;background-color: #000;padding: 0px 50px"></div>
</div>
</body>
</html>
