runtime error

Exit code: 1. Reason: [notice] A new release of pip is available: 26.1.2 -> 26.2.1 [notice] To update, run: pip install --upgrade pip File "/home/user/app/app.py", line 28 background:linear-gradient(135deg, var(--purple), var(--purple-light)); ^ SyntaxError: invalid decimal literal

Container logs: