break points min, max, min-max

_helper.scss

@mixin break-min($min) {
	@media only screen and (min-width: $min) {
		@content;
	}
}

@mixin break-max($max) {
	@media only screen and (max-width: $max - 1px) {
		@content;
	}
}

@mixin break-min-max($min, $max) {
	@media only screen and (min-width: $min) and (max-width: $max - 1px) {
		@content;
	}
}