webpack-bootstrap-ui-kit/src/scss/_animations.scss

// pulse
@keyframes pulse {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(.8);
    }

    100% {
        transform: scale(1);
    }
}

@keyframes fade {
    0% {
        filter: grayscale(0);

        opacity: 1;
    }

    50% {
        filter: grayscale(1);

        opacity: .5;
    }

    100% {
        filter: grayscale(0);

        opacity: 1;
    }
}

@keyframes expand {
    from {
        max-height: 0;
        overflow: hidden;
    }

    to {
        max-height: 500rem;
        max-height: 200vh;
        overflow: visible;
    }
}