.expand_element .expand_content {
    transition: 500ms;
    opacity: 1;
}

.expand_element:not(.open) .expand_content {
    height: 0;
    margin-top: 0;
    margin-bottom: 0;
    padding-top: 0;
    padding-bottom: 0;
    overflow: hidden;
    opacity: 0;
}

.expand_element.open.transition .expand_content {
    height: var(--scroll-height);
    overflow: hidden;
}

.expand_element.open:not(.transition) .expand_content {
    height: auto;
}