.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: 200px;
	}


    #banner>div {
	     width: 548px;
		 height: 80px;
	}
	
	#banner>div:last-child {
		margin-top: 10px;
	}
	

    #contents-left {
	     width: 435px;
	}

    #contents-right {
	     width: 100px;
	}
	
}

@media screen and (max-width: 580px) {
	#body {
		width: 320px;
	}
	
	#intro>div {
		width: 148px;
		
	}
	
	#intro>div:nth-child(2) {
	    display: none;
		margin-top: 10px;
		width: 148px;
	}
	
	#intro>div:nth-child(3) {
	    display: none;
		margin-top: 10px;
	}
	
	#banner>div {
		width: 308px;
		height: 100px;
	}
	
	#banner>div:last-child {
		margin-top: 10px;
	}
	
	#contents-left {
		width: 308px;

	}
	
	#contents-right {
		width: 308px;
		margin-top: 10px;
	}
	
	
}