.book-summary ul.summary li span {
  cursor: not-allowed;
  opacity: 0.3;
}

.book-summary ul.summary li.chapter span {
  opacity: 1;
  font-weight: bold;
}

.book-summary ul.summary li a:hover {
  color: #008cff;
  text-decoration: none;
}

code[class*="language-"],
pre[class*="language-"] {
  text-shadow: none;
}

.color-theme-2 .token.keyword {
  color: #3ac;
}

.token.operator {
  background: none;
}