* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.slideshow {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
}

.slide {
    position: fixed;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 2s ease-in-out;
}

.slide.active {
    opacity: 1;
}

.slide::before {
    content: "";
    position: fixed;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0.4;
    /* Transparenz der Bilder */
    z-index: -1;
}

.slide1::before {
    background-image: url("../images/01.jpg");
}

.slide2::before {
    background-image: url("../images/02.jpg");
}

.slide3::before {
    background-image: url("../images/03.jpg");
}

.slide4::before {
    background-image: url("../images/04.jpg");
}