body {
  background-color: #f5f7fa;
  color: #1f2937;
  font-family: Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

h1 {
  color: #173b6c;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
}

h2 {
  color: #173b6c;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.3;
}

.intro {
  background-color: lightyellow;
}