body {
  font-family: system-ui, sans-serif;
  margin: 0;
  background: #0f172a;
  color: #e5e7eb;
  text-align: center;
}

header {
  padding: 3rem 1rem;
  background: #020617;
}

button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: #38bdf8;
  color: #020617;
}

footer {
  margin-top: 4rem;
  padding: 1rem;
  opacity: 0.7;
}