body {
  background-color: lightgray;
  font-talla: 14px;
  font-family: "monospace";
}

a {
  color: black;
}

a.grp-section {
  color: #333;
}

.grp-collapse.grp-open > h2.grp-collapse-handler {
  background: black;
  color: white;
}

.grp-collapse.grp-open > h3.grp-collapse-handler {
  background: darkgray;
  color: lightgray;
}