h1 {
  font-size: 2.5em;
  font-weight: bold;
  color: #333;
  margin-bottom: 18px;
}

h2 {
  font-size: 2em;
  font-weight: bold;
  color: #555;
  margin-bottom: 15px;
}

h3 {
  font-size: 1.8em;
  font-weight: bold;
  color: #777;
  margin-bottom: 12px;
}

h4 {
  font-size: 1.5em;
  font-weight: bold;
  color: #999;
  margin-bottom: 10px;
}

h5 {
  font-size: 1.2em;
  font-weight: bold;
  color: #BBB;
  margin-bottom: 8px;
}