span.section {
    /* this is for the "Answer:" section title */
    font-weight: bold;
}
p.hidden {
    /* this is for the "Show Answer" pseudo-link, etc. */
    text-decoration: underline;
    font-variant: small-caps;
    cursor: pointer;
    color: gray;
}
div.hidden {
    /* start out hidden */
    display: none;
}