.accordion {
    position: sticky; top: var(--scroll-top-height); z-index: var(--z-index-sticky);
    padding: 0.5em 0;
    font-size: 2rem;
    background-color: var(--color-base-2);
    cursor: pointer;
}
.accordion + * {
    overflow: hidden;
}
.accordion.closed + * {
    height: 0;
    margin: 0;
    padding: 0;
}

.accordion-toggle {
    display: inline-block;
    width: 2em;
    text-align: center;
}