#preview-update {
    position: fixed;
    bottom: 1rem;
    left: 1rem;
    right: 1rem;
    z-index: 10000;
    padding: 1rem;
    border: 2px solid #fff;
    border-radius: .5rem;
    background: #111827;
    color: #fff;
    box-shadow: 0 2px 12px #0008;
}
#preview-update button {
    margin-top: .5rem;
    padding: .5rem 1rem;
    border: 2px solid #fff;
    border-radius: .25rem;
    background: #fff;
    color: #111827;
    cursor: pointer;
}
#preview-update button:focus-visible { outline: 3px solid #38bdf8; outline-offset: 3px; }