#u {
    height: 300px;
    width: 300px;
}

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

nav ul li div {
    padding: 5px;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    padding-top: 8px;
}

.mitte {
    display: flex;
    justify-content: center;
    align-items: center;
}