h1 a { text-decoration: none; color: black }
h2 a { text-decoration: none; color: black }
h3 a { text-decoration: none; color: black }
h4 a { text-decoration: none; color: black }

h1 { text-decoration: underline; }
h2 { text-decoration: underline; }

pre { border: 1px solid grey; padding: 0.5em 0.5em 0.5em 0.5em; }