Premium Collectible Banknotes: Authenticity, Security & How to Build a Collection :root --bg: #0f172a; /* slate-900 */ --panel: #111827; /* gray-900 */ --ink: #e5e7eb; /* gray-200 */ --muted: #9ca3af; /* gray-400 */ --accent: #60a5fa; /* blue-400 */ --accent-2: #34d399;