body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f9f6f1;
  color: #333;
}

header {
  background: #006400;
  color: #fff;
  padding: 20px;
  text-align: center;
}

nav {
  background: #004d00;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

nav a {
  color: #fff;
  padding: 10px 15px;
  text-decoration: none;
}

nav a:hover {
  background: #003300;
}

main {
  padding: 20px;
  text-align: center;
}

.btn {
  display: inline-block;
  margin: 10px;
  padding: 10px 15px;
  background: #006400;
  color: #fff;
  text-decoration: none;
  border-radius: 5px;
}

.btn:hover {
  background: #004d00;
}

footer {
  background: #006400;
  color: #fff;
  text-align: center;
  padding: 10px;
}