/*
 * Indents each chapter title in the left sidebar so that they aren't
 * at the same level as the section headers.
 */
.chapter-item {
    margin-left: 1em;
}

/*
 * Prevents a large gap between successive section headers.
 *
 * mdbook sets 'margin-top: 2.5em' on h2 and h3 headers. This makes sense when separating
 * a header from the paragraph beforehand, but has the downside of introducing a large
 * gap between headers that are next to each other with no text in between.
 *
 * This rule reduces the margin in this case.
 */
 h1 + h2, h2 + h3 {
    margin-top: 1.0em;
 }