@media screen and (min-width: 900px) {
    .u-hidden-desk {
        display: none;
    }
}

@media not screen and (min-width: 900px) {
    .u-visible-desk {
        display: none;
    }
}

@each $name, $value in $breakpoints {

	@include below( $name ) {
		.u-mq-above-#{$name} {
			display: none;
		}
	}

	@include above( $name ) {
		.u-mq-below-#{$name} {
			display: none;
		}
	}
}