@media screen and (max-width:1300px){
	.main {
		width: 1100px;
	}
	.banner {
		height: 214px;
	}
}

@media screen and (max-width:1200px){
	.main {
		width: 1000px;
	}
	.banner {
		height: 192px;
	}
}

@media screen and (max-width:1100px){
	.main {
		width: 900px;
	}
	nav .container > div > ul > li > a {
		padding: 20px 10px;
	}
	.banner {
		height: 170px;
	}

}