@media (max-width: 991px){
.sm-margin-30px-bottom {
    margin-bottom: 30px !important;
}
	.main-banner
	{
		background: url(img/sub.jpg);
		width: 100%;
		height: 50vh;
	}
	.banner-img
	{
		padding-top: 50px;
	}
}
@media (min-width: 991px)
{
	.main-banner
	{
		background: url(img/sub.jpg);
		width: 100%;
		height: 100vh;
		max-width: 100%;
		background-repeat: no-repeat;

	}
	.banner-img
	{
		padding-top: 100px;
	}
	.banner-img img
	{
		height: 470px;
	}
}