#lesson-title h1 {
  font-size: 22px;
}
h3 {
  color: #00428e;
  font-size: 120%;
  font-weight: 800;
}
h4 {
  font-weight: 800;
}
.reference {
  padding: 1em;
  border: 1px solid #00428e;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 800;
}