.book-toc > li:nth-child(2),
.book-toc > li:nth-child(3),
.book-toc > li:nth-child(5),
.book-toc > li:nth-child(8),
.book-toc > li:nth-child(9),
.book-toc > li:nth-child(11),
.book-toc > li:nth-child(12),
.book-toc > li:nth-child(14),
.book-toc > li:nth-child(15),
.book-toc > li:nth-child(16),
.book-toc > li:nth-child(17),
.book-toc > li:nth-child(18),
.book-toc > li:nth-child(19) {
  padding-left: 10px;
}



@media (max-width: 991.98px) {
  .book-toc > li:nth-child(3),
  .book-toc > li:nth-child(15),
  .book-toc > li:nth-child(25) {
    top: unset;
  }
}