## Description 

Update gas reference prize graph styling



https://github.com/MystenLabs/sui/assets/10210143/38b4722d-97f0-409c-a831-e60b9c68b867



https://github.com/MystenLabs/sui/assets/10210143/bbc073a2-0caa-493d-83f1-7fc791e52e52

closes APPS-874

## Test Plan 

Manual testing

---
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### Type of Change (Check all that apply)

- [ ] protocol change
- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes