h1 { text-align: center; }
.sidebar li a { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: block; }

/* Hide all chapter and section numbers in sidebar */
.sidebar .section-number,
.chapter li > a > strong[aria-hidden="true"],
.chapter li .section-number,
.chapter li > span > a > strong[aria-hidden="true"],
.chapter li > a > strong,
.chapter li > span > a > strong {
    display: none !important;
}

/* Restrict in-page sidebar TOC to only top-level H2 headings (hide H3, H4, etc.) */
.sidebar .on-this-page ol,
.sidebar .on-this-page li li,
.sidebar .header-item .header-item,
.sidebar .header-item ol {
    display: none !important;
}