body {
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
  color: #333;
  background: #ffffff;
}

header {
  background: #f8f8f8;
  padding: 20px;
  border-bottom: 1px solid #ddd;
}

nav {
  max-width: 900px;
  margin: auto;
}

nav a {
  margin-right: 20px;
  text-decoration: none;
  color: #333;
  font-weight: 500;
}

nav a:hover {
  color: #0077cc;
}

main {
  padding: 40px;
  max-width: 900px;
  margin: auto;
}

h1 {
  font-size: 32px;
  margin-bottom: 20px;
}

p {
  font-size: 16px;
  line-height: 1.6;
}