Fix min-width/max-width conflict

[cferdinandi]

// Calculate pixels from ems
@function calc-px($em, $base: 16) {
	$em: strip-unit($em);
	$base: strip-unit($base);
	@if $em == 1px {
		@return 1px;
	}
	@return ($em * $base) * 1px;
}

@media (max-width: (calc-em(calc-px($bp-large) - 1))) { ... }