jellyfin-web/dashboard-ui/bower_components/emby-webcomponents/slideshow/style.css

.slideshowSwiperContainer, .swiper-wrapper, .swiper-slide {
    background: #000;
}

.slideshowImage, .slideshowSwiperContainer {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    z-index: 1001;
    background-position: center center;
    background-size: contain;
    background-repeat: no-repeat;
    margin: 0 !important;
    color: #fff;
    line-height: normal;
}

    .slideshowImage.cover {
        background-size: cover;
    }

.slideshowImageText {
    position: fixed;
    bottom: .25em;
    right: .5em;
    color: #fff;
    z-index: 1002;
    font-weight: 400;
}

.swiper-slide img {
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: 100%;
    -ms-transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    position: absolute;
    left: 50%;
    top: 50%;
}

.btnSlideshowExit {
    z-index: 1002;
    position: absolute;
    top: 1.5vh;
    left: 1.5vh;
    width: 6vh;
    height: 6vh;
    color: #eee;
}

paper-fab.btnSlideshowExit {
    background-color: #444;
}

.slideshowControlBar {
    position: fixed;
    left: 0;
    bottom: 0;
    right: 0;
    z-index: 1002;
    background: rgba(0,0,0,.5);
    text-align: center;
    color: #eee;
}

.mouseIdle .btnSlideshowExit {
    display: none;
}

.mouseIdle .slideshowControlBar {
    transform: translateY(100%);
    transition: transform 600ms ease-out;
}

.slideshowButton {
    width: 8vh;
    height: 8vh;
}

.slideText {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 10vh;
    text-align: center;
}

.slideTextInner {
    margin: 0 auto;
    max-width: 60%;
    background: rgba(0,0,0,.8);
    display: inline-block;
    padding: .5em 1em;
    border-radius: .25em;
}

.slideTitle {
    font-size: 180%;
}

.slideSubtitle {
    color: #ccc;
}

.swiper-slide paper-spinner {
    width: 10vh;
    height: 10vh;
    position: absolute;
    left: 50%;
    top: 50%;
    margin-left: -5vh;
    margin-top: -5vh;
    z-index: 1003;
}