:root {
  color: #181c21;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-synthesis: none;
}

body { margin: 0; min-width: 280px; }

main {
  margin: 0 auto;
  max-width: 1220px;
  padding: 20px;
}

@media (max-width: 640px) {
  main { padding: 8px; }
}