@mixin radial-gradient-animation( $fallback, $start, $end, $transTime ){
	background-size: 100%;
	position: relative;
	z-index: 100;
	&:before {
		background: $fallback;
		background: radial-gradient($start, $end);
		content: '';
		display: block;
		height: 100%;
		position: absolute;
		top: 0; left: 0;
		opacity: 0;
		width: 100%;
		z-index: -100;
		transition: opacity $transTime;
	}
	&:hover {
		&:before {
			opacity: 1;
		}
	}
}

@mixin linear-gradient-animation( $fallback, $direction, $start, $middle, $end, $transTime ){
	background-size: 100%;
	position: relative;
	z-index: 100;
	&:before {
		background: $fallback;
		background: linear-gradient($direction, $start, $middle, $end);
		content: '';
		display: block;
		height: 100%;
		position: absolute;
		top: 0; left: 0;
		opacity: 0;
		width: 100%;
		z-index: -100;
		transition: opacity $transTime;
	}
	&:hover {
		&:before {
			opacity: 1;
		}
	}
}