@include u-keyframes(quiver) {
    0% {
        @include u-transform(translate3d(2px, 1px, 0) rotate(0deg));
    }
    10% {
        @include u-transform(translate3d(-1px, 2px, 0) rotate($saf-quiver-angle));
    }
    20% {
        @include u-transform(translate3d(-3px, 0) rotate($saf-quiver-angle * -1));
    }
    30% {
        @include u-transform(translate3d(0, 2px, 0) rotate(0deg));
    }
    40% {
        @include u-transform(translate3d(1px, -1px, 0) rotate($saf-quiver-angle));
    }
    50% {
        @include u-transform(translate3d(-1px, 2px, 0) rotate($saf-quiver-angle * -1));
    }
    60% {
        @include u-transform(translate3d(-3px, 1px, 0) rotate(0deg));
    }
    70% {
        @include u-transform(translate3d(2px, 1px, 0) rotate($saf-quiver-angle));
    }
    80% {
        @include u-transform(translate3d(-1px, -1px, 0) rotate($saf-quiver-angle * -1));
    }
    90% {
        @include u-transform(translate3d(2px, 2px, 0) rotate(0deg));
    }
    100% {
        @include u-transform(translate3d(1px, -2px, 0) rotate($saf-quiver-angle));
    }

}

@mixin quiver($duration: 0.75s, $delay: 0s, $fill-mode: none, $count: infinite) {
    // hack to fix jagged edges
    outline: 1px solid transparent;
    @include u-animation(quiver $duration $delay $fill-mode $count);
}