/* Lesson parts (Osa 1, Osa 2, ...): third nav level, shown bold with a folder icon */
.md-nav__item--nested .md-nav__item--nested .md-nav__item--nested > label.md-nav__link {
  font-weight: 700;
}

.md-nav__item--nested .md-nav__item--nested .md-nav__item--nested > label.md-nav__link::before {
  content: "";
  flex-shrink: 0;
  width: 1.1em;
  height: 1.1em;
  margin-right: 0.4em;
  background-color: currentColor;
  -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 18H4V8h16m0-2h-8l-2-2H4c-1.11 0-2 .89-2 2v12a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2V8a2 2 0 0 0-2-2"/></svg>') no-repeat center / contain;
          mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 18H4V8h16m0-2h-8l-2-2H4c-1.11 0-2 .89-2 2v12a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2V8a2 2 0 0 0-2-2"/></svg>') no-repeat center / contain;
}