body{background:#0f172a;color:#fff}
.panel{position:fixed;right:0;top:0;width:300px;height:100%;background:#1e293b;padding:20px}
#toast{position:fixed;bottom:20px;right:20px;background:#22c55e;padding:10px;border-radius:8px;opacity:0;transition:.3s}
#toast.show{opacity:1}