body {
  font-family: Arial, sans-serif;
  max-width: 900px;
  margin: auto;
  padding: 40px;
  line-height: 1.7;
  color: #222;
}

header {
  text-align: center;
  margin-bottom: 50px;
}

h1 {
  font-size: 42px;
}

section {
  margin-bottom: 40px;
}

h2 {
  border-bottom: 2px solid #eee;
  padding-bottom: 6px;
}

ul {
  padding-left: 20px;
}

footer {
  text-align: center;
  color: #777;
  margin-top: 60px;
}