.chapter-nav {
  position: sticky;
  z-index: 60;
  top: 94px;
  background: #ffffff;
  border-bottom: 1px solid #ded7d1;
}
.chapter-nav-container {
  width: calc(100% - 80px);
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  gap: 0;
  overflow-x: auto;
  padding: 0;
  scrollbar-width: none;
}
.chapter-nav-container a {
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 17px 14px;
  border-radius: 0;
  font-size: 15px;
  font-weight: 400;
  line-height: 18px;
  letter-spacing: 0.3px;
  color: #6f6f6f;
  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}
.chapter-nav-container a:hover,
.chapter-nav-container a.is-active {
  background: #a50f0f;
  color: #ffffff;
}
@media (max-width: 900px) {
  .chapter-nav {
    top: 82px;
  }
  .chapter-nav-container {
    width: calc(100% - 40px);
  }
}
@media (max-width: 560px) {
  .chapter-nav-container {
    width: calc(100% - 36px);
  }
  .chapter-nav-container a {
    padding: 14px 12px;
    font-size: 14px;
  }
}