.toc {
  width: fit-content;
  max-width: min(32rem, calc(100% - 30px));
  box-sizing: border-box;
  border: 1px solid #bbb;
  border-radius: 8px;
  padding: 18px 20px 8px;
  margin: 20px 15px;
  font-size: 0.95rem;
  position: relative;
}

.toc::before {
  font-family: "Playfair Display", Georgia, serif;
  content: "index";
  position: absolute;
  top: -12px;
  left: 14px;
  background: #fff;
  padding: 0 12px;
  font-size: 1.05rem;
  font-weight: 400;
  color: #333;
}

.toc ul {
  list-style: none;
  padding: 0;
  margin: 8px 0 0 0;
}

.toc li {
  margin: 5px 0;
}

.toc a {
  color: #2c3e50;
  text-decoration: none;
}

.toc a:hover {
  color: #3498db;
  text-decoration: underline;
}

.toc ul ul {
  padding-left: 1.4rem;
}