.App{max-width:600px;margin:0 auto;padding:20px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.login-container,.user-info{text-align:center;padding:40px}.error{background:#f8d7da;color:#721c24;padding:20px;border-radius:8px}button{background:#007bff;color:#fff;border:none;padding:10px 20px;border-radius:4px;cursor:pointer;margin:10px}button:hover{background:#0056b3}img{vertical-align:middle;margin:10px}