<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> div { width:200px; height:200px; border-width:5px; border-style:solid; border-color:pink; padding-left:30px; padding-top:50px; padding-right:30px; padding-bottom: 50px;
margin-left:auto;
margin-right:auto;
}
</style>
</head>
<body>
<div>王者农药</div>
</body>
</html>
css第一句话
* {
padding: 0;
margin:0;
}