#banner {
    margin: 5px;
    display: flex;
    align-items: center;
    flex-direction: column;
}

#banner img {
    border: 1px solid #3c3c3f;
    border-radius: 5px;
}

#banner img.banner-show {
    width: 100%;
    opacity: 1;
    transition: opacity 1s, visibility 0s;
}

#banner img.banner-hide {
    height: 0;
    width: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 1s, visibility 0s 1s;
}