.clearfix:after {
	clear: both;
	display: table;
	content: '';
}

*{
	font-size: 10pt;
}

#body {
	margin: 0 auto;
	width: 960px;
}

#head {
	border: 1px lightgray solid;
	height: 50px;
	box-shadow: 2px 2px 2px #eee;
	margin-right: 5px;
	margin-left: 5px;
}

#intro, #banner, #contents, #foot {
	margin-top: 10px;
}

#intro>div {
	border: 1px lightgray solid;
	float: left;
	width: 228px;
	height: 250px;
	margin-right: 5px;
	margin-left: 5px;
	box-shadow: 2px 2px 2px #eee;
}

#banner>div {
	border: 1px lightgray solid;
	float: left;
	margin-right: 5px;
	margin-left: 5px;
	width: 468px;
	height: 100px;
	box-shadow: 2px 2px 2px #eee;
}

#contents-left {
	width: 708px;
	height: 300px;
}

#contents-right {
	width: 228px;
	height: 300px;
}

#contents>div {
	border: 1px lightgray solid;
	float: left;
	margin-right: 5px;
	margin-left: 5px;
	box-shadow: 2px 2px 2px #eee;
}

#foot {
	border: 1px lightgray solid;
	height: 30px;
	box-shadow: 2px 2px 2px #eee;
	margin-right: 5px;
	margin-left: 5px;
}
@media screen and (max-width: 980px){
	#body{
	width:760px;
	}
	#intro>div{
	width:178px;
	height:250px;
	}
	#banner>div{
	 width:368px;
	 height:100px;
	}
	#contents-left{
		width:558px;
	}
	#contents-right{
		width:178px;
	}
}
@media screen and (max-width: 780px){
	#body{
	 width:560px;
	}
	#intro>div{
	width:128px;
	height:250px;
	}
	#banner>div{
		width:268px;
		height:100px;
	}
	#contents-left{
	width:358px;
	}
	#contents-right{
	width:178px;
	}
}

@media screen and (max-width: 580px){
	#body{
	width:320px;
	}
	#intro>div{
		width:148px;
		height:130px;
	}	
	#intro>div:nth-child(1){
	display:none;
	}
	#intro>div:nth-child(2){
	width:148px;
	}
	#intro>div:nth-child(3){
	width:148px;
	}
	#intro>div:nth-child(4){
		margin-top:10px;
		display:none;
	}

	#banner>div{
		width:308px;
		height:100px;
	}
	#banner>div:last-child{
		margin-top:10px;
	}
	#contents-left{
		width:308px;
	}
	#contents-right{
		width:308px;
		margin-top:10px;
	}
	
}