body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: #f7f7f7;
  color: #222;
}

main {
  max-width: 720px;
  margin: 4rem auto;
  padding: 2rem;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

code {
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  background: #f0f0f0;
}