body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;background:#0f172a;color:#e2e8f0}.app{text-align:center;padding:2rem}button{margin:.5rem;padding:.5rem 1rem;border:none;border-radius:6px;background:#2563eb;color:#fff;cursor:pointer;transition:background .2s ease-in-out}button:hover{background:#1d4ed8}