html {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f5f5f5;
  color: #222;
}

body {
  margin: 0;
}

main {
  max-width: 720px;
  margin: 10vh auto;
  padding: 32px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0,0,0,.06);
}

h1 {
  margin-top: 0;
}

nav {
  display: flex;
  gap: 20px;
  margin-top: 32px;
}

a {
  color: inherit;
}