.md-nav--secondary {
  border-left: 0.05rem solid #777 !important;
}

.md-nav__link--active {
  font-weight: bold !important;
  color: #ddd !important;
}

.md-tabs__item--active {
  font-weight: bold !important;
}

.md-header__topic {
  display: none !important;
}

.iframe-responsive-container {
  margin: auto;
  position: relative;
  overflow: hidden;
  padding-top: 56.25%;
}

.iframe-responsive-content {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  width: 100%;
  height: 100%;
}