/* Hollow */
@mixin hollow {
	$borderWidth: 4px;

	@include hacks();
	@include prefixed(transition-duration, $mediumDuration);
	@include prefixed(transition-property, background);
	box-shadow:
		inset 0 0 0 $borderWidth $primaryColor,
		0 0 1px rgba(0, 0, 0, 0); /* Hack to improve aliasing on mobile/tablet devices */

	&:hover,
	&:focus,
	&:active {
		background: none;
	}
}