body {
  margin:0;
  font-family:system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:#0b0d10;
  color:#f9fafb;
}

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

h1 {
  margin-top:0;
}

a {
  color:#facc15;
}

.box {
  background:#111827;
  padding:1.5rem;
  border-radius:1rem;
  border:1px solid #1f2937;
  box-shadow:0 10px 30px rgba(0,0,0,.35);
}