.md-typeset h1,
.md-typeset h2,
.md-typeset h3,
.md-typeset h4,
.md-typeset h5,
.md-typeset h6 {
  font-weight: 700;
}

u,
.chapter-intro {
  text-decoration: underline;
  text-decoration-skip-ink: none;
}

u mjx-container,
u .MathJax,
.chapter-intro mjx-container,
.chapter-intro .MathJax {
  text-decoration: underline;
  text-decoration-skip-ink: none;
}