body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  color: #222;
}

main {
  max-width: 800px;
  margin: 100px auto;
  padding: 24px;
  text-align: center;
}

h1 {
  font-size: 48px;
}

button {
  padding: 12px 20px;
  font-size: 16px;
  cursor: pointer;
}