body {
  font-family: system-ui, sans-serif;
  background: #0f172a;
  color: white;
  text-align: center;
  padding-top: 80px;
}

button {
  background: #22c55e;
  border: none;
  padding: 12px 20px;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
}