body {
  font-family: Arial;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
}

header {
  background: #ff6b00;
  color: white;
  padding: 15px;
  text-align: center;
}

nav a {
  margin: 10px;
  color: white;
  text-decoration: none;
  font-weight: bold;
}

section {
  padding: 20px;
}

.btn {
  background: #ff6b00;
  color: white;
  padding: 10px 15px;
  text-decoration: none;
  border-radius: 5px;
}

.card {
  background: white;
  padding: 15px;
  margin: 10px;
  border-radius: 10px;
}