body {
  font-family: Arial, sans-serif;
  margin: 0;
  background-color: #f8f9fa;
  color: #333;
}
header {
  background-color: #222;
  color: white;
  text-align: center;
  padding: 1.5em 0;
}
header h1 {
  margin: 0;
}
nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
}
main {
  padding: 2em;
  max-width: 800px;
  margin: auto;
  background-color: white;
}
section {
  margin-bottom: 2em;
}
footer {
  text-align: center;
  padding: 1em 0;
  background-color: #222;
  color: white;
}