.banner-main {
	display:table
	width:100%
	height:415;
	margin-top: 70px;
	
}

.banner-main img{
	position:relative;
	width:100%;
	margin:0 auto;
	
}

@media only screen and (max-width:720px){
	img#1x1{
		position:relative;
		visibility:visible;
	}
	
	img#desk {
		position:relative;
		visibility:hidden;	
	}
}

@media only screen and (min-width:720px){
		img#1x1{
		position:relative;
		visibility:hidden;	
	}
	
	img#desk {
		position:relative;
		visibility:visible;
	}
}