*, *::before, *::after { box-sizing: border-box; }

body {
  font-family: system-ui, sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
  color: #222;
}

nav {
  padding: 0.75rem 1.5rem;
  background: #1a1a2e;
  color: #fff;
}

nav a {
  color: #fff;
  text-decoration: none;
  font-weight: 600;
}

main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
}