#toc:before {
  content: "目次";
  padding-left: 8px;
}
#toc {
  backgound:#f9f9f9;
  border: 1px solid #aaa;
  font-size: 95%;
  display: table;
  margin-bottom: 10px;
  padding: 15px;
  width: auto;
}
#toc ul,
#toc ul li,
#toc ol,
#toc ol li {
  margin: 5px 5px 5px 15px;
  padding: 0;
}
#toc a:hover {
  text-decoration: underline;
}