.fade-motion(@className, @keyframeName) {
    @name: ~'@{acud-prefix}-@{className}';
    .make-motion(@name, @keyframeName);
    .@{name}-enter,
    .@{name}-appear {
        opacity: 0;
        animation-timing-function: linear;
    }
    .@{name}-leave {
        animation-timing-function: linear;
    }
}

.fade-motion(fade, acudFade);

@keyframes acudFadeIn {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

@keyframes acudFadeOut {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}