div#preamble,
div.tableblock, div.imageblock, div.exampleblock, div.verseblock,
div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
div.admonitionblock {
  margin-right: 10%;
  margin-top: 1.5em;
  margin-bottom: 1.5em;
}
div.content { /* Block element content. */
  padding: 0;
}
div.content div.title:first-child {
  margin-top: 0.0em;
}
div.listingblock > div.content {
  border: 1px solid silver;
  background: #f4f4f4;
  padding: 0.5em;
}