样式.css

#header {
	color:#990000;
	width:500px;
	height:200px;
	margin:0 auto;
	padding:10px;
	font-family:Arial, Helvetica, sans-serif;
	font-style:normal;
}

#header h1{
	text-align:center;
	font-size:2cm;
	margin:20px;
}

#header p{
	display:inline;
	margin:20px;
	width:200px;
	font-size:1cm;
}

#header button {
	background-color:orange;
	margin:10px 20px;
	padding:10px;
	width:200px;
	font-size:1cm;
}

#grid {
	width:460px;
	height:460px;
	padding:20px;
	margin:10px auto;
	background-color:olive;
	position:relative;
}

.grid-cell {
	width:100px;
	height:100px;
	background-color:orange;
	position:absolute;
}

.grid-number {
	width:100px;
	height:100px;
	color:black;
	position:absolute;
	font-size:60px;
	font-weight:bold;
	line-height:100px;
	text-align:center;
}