div.guide {
    display: flex;
    flex-flow: column;
    width: 100%;
}
details > summary {
    list-style: none;
}
details > summary::-webkit-details-marker {
    display: none;
}
details[open] {
    padding: 1em;
    background-color: var(--bg-color2);
    border: none;
    box-shadow: var(--base-shadow);
}
details[open] > summary {
    color: var(--ct-current);
    padding-bottom: 1em;
}
summary {
    color: var(--link-color-blue);
    cursor: pointer;
}