/* Add line break before H2 */
section.level2 {
  padding-top: 2em;
}

body h2:not(nav[role="doc-toc"] h2) {
  /* Pale blue background for H2 text */
  background-color: #e6f2fa; /* Very light blue */
  padding: 0.5em 1em;
  border-radius: 0.25em;
}

/* Horizontal line above H2 */
body h2:not(nav[role="doc-toc"] h2)::before {
  content: "";
  display: block;
  border-top: 2px solid #9ecae1;
  margin-bottom: 0.5em;
}

/* Horizontal line below H2 */
body h2:not(nav[role="doc-toc"] h2)::after {
  content: "";
  display: block;
  border-bottom: 2px solid #9ecae1;
  margin-top: 0.5em;
}

h3 {
  /* Space before H3 */
  margin-top: 2em;
  /* Line under H3 */
  display: inline-block;
  border-bottom: 1px solid #e5e5e5;
  padding-bottom: 0.3em;
  margin-bottom: 0.7em;
}

/* Make H4 a little bolder and a little space before */
h4 {
  font-weight: bold;
  margin-top: 1.5em;
}

/* Remove breaks */
.h2-tight {
  margin-bottom: -2em;
}
.h3-tight {
  margin-bottom: -2em;
}
.h4-tight {
  margin-bottom: -1.5em;
}