console 命令行工具 X clear

console

<!DOCTYPE html>
<html>

<head>
	<meta charset="UTF-8">
	<title>Html和CSS的关系</title>
	<style type="text/css">
		div{
            backgroud:color:blue;
        }
        h1 {
			color: red;
			border: 1px solid blue;
			width: 140px;
			height: 140px;
			text-align: center;
		}

	</style>
</head>

<body>
	<div>
		<h1>Hello World!</h1>
	</div>
</body>

</html>