.bg-contain{
	width: 100%;
	height: 100%;
	background-position: center;
	background-size: contain;
	background-repeat: no-repeat;
}

.bg-cover{
	width: 100%;
	height: 100%;
	background-position: center;
	background-size: cover;
	background-repeat: no-repeat;
}
.banner_728-90-mobile .bg-cover{
	width: 100%;
	height: 90px;
	background-position: center;
	background-size: cover;
	background-repeat: no-repeat;
	display: block;
}