body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background-color: #fafafa;
  color: #333;
}
header {
  background-color: #4CAF50;
  color: white;
  padding: 1.5rem;
  text-align: center;
}
main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 1rem 2rem;
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
h1, h2, h3 {
  margin-top: 1rem;
}
ul {
  margin-left: 1.5rem;
}
footer {
  text-align: center;
  padding: 2rem 0;
  font-size: 0.9rem;
  color: #777;
}
a {
  color: #4CAF50;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}