body {
  font-family: system-ui, sans-serif;
  background: #0d1117;
  color: #e6edf3;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
}

main {
  max-width: 480px;
  padding: 2rem;
  border: 1px solid #30363d;
  border-radius: 12px;
  background: #161b22;
}

h1 {
  margin-top: 0;
}

a {
  color: #58a6ff;
}