.book .book-summary * {
  background-color: #373737ff;
  color: white!important;
}

.book .book-body * {
  background-color: rgb(40, 42, 53)!important;
  color: white!important;
}

.book .Rchunk {
  background-color: #E8E8E8 !important;
}

.book .book-body a {
  background-color: rgb(40, 42, 53)!important;
  color: #4169E1!important;
}

.book .book-body .page-wrapper .page-inner section.normal pre {
    color: white!important;
    background-color: #505050ff!important;
    background: #505050ff!important;
}

.book .book-body .page-wrapper .page-inner section.normal pre span {
    color: white!important;
    background-color: #505050ff!important;
    background: #505050ff!important;
}

.book div {
  background-color: rgb(40, 42, 53)!important;
}

.book .book-body .page-wrapper .page-inner section.normal span a {
    color: white!important;
}