@include u-keyframes(popIn) {
    0% {
        @include u-transform(scale(0.25) translateZ(0));
        opacity: 0;
    }
    100% {
        opacity: 1;
        @include u-transform(scale(1));
    }
}

@mixin popIn($duration: 0.5s, $delay: 0s, $fill-mode: forwards) {
    @include u-animation(popIn $duration $delay $fill-mode);
}