nav-book.css in Open Social 8.6

.nav-book {
  padding: 0;
}

.nav-book .menu-item {
  list-style: none;
  padding-top: 3px;
  padding-bottom: 3px;
  clear: both;
  padding-left: 1.25rem;
  position: relative;
}

.nav-book .menu-item:before {
  content: '\25CB';
  position: absolute;
  left: 0;
}

.nav-book .menu-item.menu-item--collapsed:before {
  content: '\25B8';
}

.nav-book .menu-item--expanded .menu {
  padding-left: 0;
}

.nav-book .menu-item--expanded.menu-item--has-children:before {
  content: '\25BE';
}

.navigation-book {
  padding: 0.5em 0;
  font-size: 14px;
}

.navigation-book a:hover {
  text-decoration: underline;
}

.navigation-book .page-links {
  text-align: center;
  font-size: 14px;
}

.navigation-book .pager__item {
  display: block;
  position: relative;
}

.navigation-book .pager__item span {
  display: inline-block;
  max-width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.navigation-book .pager__item .icon-inline {
  margin-top: 6px;
  position: absolute;
  top: 0;
}

.navigation-book .pager__item .icon-inline + span {
  line-height: 24px;
}

.navigation-book .pager__item--previous {
  text-align: left;
  margin-bottom: 5px;
}

.navigation-book .pager__item--previous span {
  padding-left: 24px;
}

.navigation-book .pager__item--previous .icon-inline {
  left: 0;
  margin-left: 12px;
}

.navigation-book .pager__item--next {
  text-align: right;
  margin-left: 0px;
}

.navigation-book .pager__item--next span {
  padding-right: 24px;
}

.navigation-book .pager__item--next .icon-inline {
  right: 0;
  margin-right: 12px;
}

#book-outline {
  min-width: 56em;
}

.book-outline-form .form-item {
  margin-top: 0;
  margin-bottom: 0;
}

html.js #edit-book-pick-book {
  display: none;
}

.form-item-book-bid .description {
  clear: both;
}

#book-admin-edit select {
  margin-right: 24px;
}

#book-admin-edit select.progress-disabled {
  margin-right: 0;
}

#book-admin-edit tr.ajax-new-content {
  background-color: #ffd;
}

#book-admin-edit .form-item {
  float: left;
}

@media (min-width: 600px) {
  .navigation-book .pager__item {
    max-width: 50%;
    display: inline-block;
  }
  .navigation-book .pager__item--previous {
    margin-bottom: 0px;
    float: left;
  }
  .navigation-book .pager__item--next {
    float: right;
  }
}