.ad {
    position: absolute;
}

.ads {
    text-align: right;
}

.slide:nth-child(odd) {
    opacity: 1;
    animation: fadeStart;
    animation-duration: 8s;
    animation-iteration-count: infinite;
}

.slide:nth-child(even) {
    opacity: 0;
    animation-name: fadeEnd;
    animation-duration: 8s;
    animation-iteration-count: infinite;
}

@keyframes fadeStart {
    0% {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }

    100% {
        opacity: 1;
    }
}

@keyframes fadeEnd {
    0% {
        opacity: 0;
    }

    50% {
        opacity: 1;
    }

    100% {
        opacity: 0;
    }
}