.theme-code-header {
  text-align: center;
  .link {
    display: block;
  }
  .title {
    font-size: 2em;
    font-weight: bold;
    display: block;
    vertical-align: middle;
    white-space: nowrap;
    padding: 10px 0;
    color: #000;
    margin: 0;
  }
}
.book-summary {
  border-right: 1px solid #ddd;
  width: 210px;
  background-color: #f1f1f1;
  ul.summary {
    & > li {
      &.chapter {
        margin-top: 15px;
        &.active {
          & > span, & > a {
            color: #008cff;
          }
        }
        & > span, & > a {
          color: #515151;
          line-height: 22px;
          font-weight: bold;
          padding-top: 0;
          padding-bottom: 0;
        }
      }
      .chapter {
        &.active {
          & > a {
            color: #008cff;
          }
        }
        & > a {
          color: #515151;
          line-height: 22px;
          font-weight: normal;
          padding-top: 0;
          padding-bottom: 0;
        }
        & > .articles {
          margin-top: 5px;
        }
      }
    }
  }
}