.toc {
  font-size: 14px;
  margin-bottom: 20px;
  background: #fbfbfb;
  border-left: 2px solid #eee;
}

.toc > ul {
  padding: 8px 0;
}

.toc > ul li {
  list-style: none;
}

.toc li > ul {
  text-indent: 8px;
  font-size: 12px;
  display: none;
}

.toc a {
  padding-left: 16px;
  border-left: 2px solid #eee;
  margin-left: -2px;
  display: block;
  transition: all 0.3s ease;
  white-space: nowrap;
  overflow: hidden;
  color: #666;
}

.toc a:hover {
  color: #2db7f5;
}

.toc a.current {
  border-color: #2db7f5;
  color: #2db7f5;
}