body { font-family: 'Segoe UI', sans-serif; background-color: #1a1a2e; color: white; display: flex; justify-content: center; padding: 50px; }
.container { background: #16213e; padding: 30px; border-radius: 15px; border: 2px solid #0f3460; max-width: 600px; }
h1 { color: #4ecca3; }
button { padding: 10px 20px; background: #e94560; color: white; border: none; cursor: pointer; border-radius: 5px; margin-top: 10px; }