$space-shift-range-start: 1;
$space-shift-range-end: 3;

@mixin shift-classes() {
	@for $i from $space-shift-range-start through $space-shift-range-end {
		.shift-#{$i},
		.child-shift-#{$i} > *:first-child {
			@include margin-top($i);
		}
	}
}