body {
    background-color: #000;
    background-size: contain;
    background-repeat: no-repeat;
    height: 90vh;
    background-position: center;
    font-family: 'Avenir', sans-serif;
    font-size: 16px;
}

.footer a {
    color:#00ef00;
    font-size:10pt;
    text-decoration: none;
}
.footer {
    position: absolute;
    bottom: 30px;
    margin-left: 50px;
}

.box {
    border: 1px solid #00ef00;
    padding: 0 15px;
    font-size: 12px;
}

@media (min-width:769px) {
    body {
        background-image: url("../img/startseite.jpg");

    }
    .desktop-hidden {
        display:none;
    }
}

@media (max-width:768px) {
    body {
        background-image: url("../img/background_mobile2.png");
        background-size: cover;
    }
    .desktop-hidden {
        color:#00ef00;
        position: absolute;
        top: 59%;
        left: 50%;
        transform: translate(-50%, -50%);
    }
}