body {
    padding: 0;
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
.mitte {
    display: flex;
    justify-content: center;
    align-items: center;
}

#bild {
    width: 100%;
    height: 300px;
}

#bild img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

nav ul li a, footer ul li a {
    padding: 10px;
    font-weight: 600;
}

@media screen and (min-width: 800px) {
    #bild {
        height: 450px;
    }
}

nav {
    position:sticky;
    top:0;
    backdrop-filter: blur(4px);
}

footer ul, nav ul {
    list-style: none;
    padding-top: 24;
    padding-bottom: 24;
    margin: 0;
}

footer {
    margin-left: 10;
}

section {
    max-width: 1000;
    margin-left: auto;
    margin-right: auto;
    padding-left: 16;
    padding-right: 16px;
}