/* Trim */
.trim() {
	@outerBorderWidth: 4px;
	@innerBorderWidth: 4px;

	.hacks();
	position: relative;

	&:before {
		content: '';
		position: absolute;
		border: white solid @innerBorderWidth;
		top: @outerBorderWidth;
		left: @outerBorderWidth;
		right: @outerBorderWidth;
		bottom: @outerBorderWidth;
		opacity: 0;
		.prefixed(transition-duration, @mediumDuration);
		.prefixed(transition-property, opacity);
	}

	&:hover:before,
	&:focus:before,
	&:active:before {
		opacity: 1;
	}
}