.darken {
    visibility: hidden;

    position: fixed;
    inset: 0;

    background-color: rgba(0, 0, 0, 0.0);
    cursor: pointer;
    transition: background-color var(--transition-time) ease-in-out;
}
.darkenActive {
    visibility: initial;
    background-color: rgba(0, 0, 0, 0.5);
}