html {
  font-family: sans-serif;
}

h3 {
  font-weight: normal;
}

td {
  border: 1px solid #ccc;
  padding: 5px;
}

#nav {
  font-size: 19px;
  border-bottom: 1px solid gray;
  padding-bottom: 10px;
  margin-bottom: 10px;
}
#nav a {
  color: gray;
  margin-right: 10px;
}
#nav a:not(.active):hover {
  text-decoration: underline;
  cursor: pointer;
}
#nav a.active {
  color: black;
  text-decoration: underline;
}

#views > div {
  display: none;
}
#views > div.active {
  display: block;
}

.collapsable {
  display: none;
}
.collapsable.open {
  display: block;
}
.toggle-collapsable {
  color: blue;
  cursor: pointer;
}
.toggle-collapsable:hover {
  text-decoration: underline;
}