body {
  font-family: Arial, sans-serif;
  background: #f4f9f4;
  margin: 0;
  padding: 20px;
  color: #333;
}

header {
  background: #4caf50;
  color: white;
  padding: 10px;
  text-align: center;
}

section {
  margin: 20px 0;
  padding: 15px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
}

button {
  background: #4caf50;
  color: white;
  border: none;
  padding: 10px;
  margin-top: 10px;
  cursor: pointer;
  border-radius: 5px;
}

button:hover {
  background: #388e3c;
}