#overlay-slideshow {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.8);
    z-index: -1;
}

#pixie {
    z-index: -1;
}

.sf-slideshow {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0px;
    left: 0px;
    z-index: -3;
    list-style-type: none;
}
.sf-slideshow li span {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0px;
    left: 0px;
    color: transparent;
    background-size: cover;
    background-position: 50% 50%;
    background-repeat: none;
    opacity: 0;
    z-index: 0;
    -webkit-backface-visibility: hidden;
    /*Entspricht der Länge von drei Slides*/
    -webkit-animation: imageAnimation 18s linear infinite 0s;
    -moz-animation: imageAnimation 18s linear infinite 0s;
    -o-animation: imageAnimation 18s linear infinite 0s;
    -ms-animation: imageAnimation 18s linear infinite 0s;
    animation: imageAnimation 18s linear infinite 0s;
}
.sf-slideshow li:nth-child(1) span {
    background-image: url(../Images/backgrounds/mountains.jpg)
}
.sf-slideshow li:nth-child(2) span {
    background-image: url(../Images/backgrounds/field.jpg);
    -webkit-animation-delay: 6s;
    -moz-animation-delay: 6s;
    -o-animation-delay: 6s;
    -ms-animation-delay: 6s;
    animation-delay: 6s;
}
.sf-slideshow li:nth-child(3) span {
    background-image: url(../Images/backgrounds/ocean.jpg);
    -webkit-animation-delay: 12s;
    -moz-animation-delay: 12s;
    -o-animation-delay: 12s;
    -ms-animation-delay: 12s;
    animation-delay: 12s;
}

/*
Bei Veränderung der Anzahl der Slides müssen die Prozentwerte verändert werden
8 % von 18 s = Zeit für das Einfaden (1,44 s)
33 % von 18 s = Beginn des Ausfadens + 8 % = 41 % Zeit für das Ausfaden
33 und 41 müssen der Anzahl entsprechend verändert werden
*/
@-webkit-keyframes imageAnimation {
    0% { opacity: 0; -webkit-animation-timing-function: ease-in; }
    8% { opacity: 1; -webkit-animation-timing-function: ease-out; }
    33% { opacity: 1 }
    41% { opacity: 0 }
    100% { opacity: 0 }
}
@-moz-keyframes imageAnimation {
    0% { opacity: 0; -moz-animation-timing-function: ease-in; }
    8% { opacity: 1; -moz-animation-timing-function: ease-out; }
    33% { opacity: 1 }
    41% { opacity: 0 }
    100% { opacity: 0 }
}
@-o-keyframes imageAnimation {
    0% { opacity: 0; -o-animation-timing-function: ease-in; }
    8% { opacity: 1; -o-animation-timing-function: ease-out; }
    33% { opacity: 1 }
    41% { opacity: 0 }
    100% { opacity: 0 }
}
@-ms-keyframes imageAnimation {
    0% { opacity: 0; -ms-animation-timing-function: ease-in; }
    8% { opacity: 1; -ms-animation-timing-function: ease-out; }
    33% { opacity: 1 }
    41% { opacity: 0 }
    100% { opacity: 0 }
}
@keyframes imageAnimation {
    0% { opacity: 0; animation-timing-function: ease-in; }
    8% { opacity: 1; animation-timing-function: ease-out; }
    33% { opacity: 1 }
    41% { opacity: 0 }
    100% { opacity: 0 }
}