$speeds: ("fast": $t-fast-standard, "medium": $t-medium-standard, "slow": $t-slow-standard);

@each $speed, $transition in $speeds {
	$name: fade-#{$speed};

	.#{$name}-enter-active, .#{$name}-leave-active {
		transition: opacity $transition;
	}
	.#{$name}-enter-from, .#{$name}-leave-to {
		opacity: $o-0;
	}
}