.cb-slideshow,
.cb-slideshow:after {
    margin: 0;
    padding: 0;
    list-style: none;
    position: absolute;
    width: 100%;
    height: 670px;
    top: 0px;
    left: 0px;
    z-index: 0;
    overflow: hidden;
}

    .cb-slideshow:after {
        content: '';
        /*background: transparent url(/images/pattern.png) repeat top left;*/
    }

    .cb-slideshow li span {
        -webkit-transform: translateZ(0);
        -moz-transform: translateZ(0);
        -ms-transform: translateZ(0);
        -o-transform: translateZ(0);
        transform: translateZ(0);
        width: 100%;
        height: 670px;
        position: absolute;
        top: 0px;
        left: 0px;
        color: transparent;
        background-size: cover;
        background-position: 50% 50%;
        background-repeat: no-repeat;
        opacity: 0;
        z-index: 0;
        animation: imageAnimation 30s linear infinite 0s;
    }

@keyframes imageAnimation {
    0% {
        opacity: 0;
        animation-timing-function: ease-in;
    }

    8% {
        opacity: 1;
        animation-timing-function: ease-out;
    }

    17% {
        opacity: 1;
    }

    25% {
        opacity: 0;
    }

    100% {
        opacity: 0;
    }
}