Wrong colour for Event numbers

**Version of the documentation in which you are reporting the error**
2026-05-06 v20.0:662a331439

**Describe the technical error**
- The event number in the heading is black on orange
- Expected white on orange

**Screenshots**

(from https://docs.dyalog.com/20.0/object-reference/methodorevents/keypress/ but applies to all such pages)

**Platform on which you are seeing the error**

Desktop (please complete the following information):
- Microsoft Windows
- 11
- Firefox