changed homepage bg colour from white to #f8f8f8

[warren-davies4]

❓What: Changed background colour on home page from white to #f8f8f8 (light gray, matches rest of site)

🧠Why?: Accessibility

👨‍💻How?: updated CSS class container--white

Checklist:

Have checked for the following: Yes

• [ ] The website still builds correctly, and you can view it using mkdocs serve.
• [ ] There are no new "warnings" from mkdocs
• [ ] Does your page follow the page template (or here in Markdown)?
• [ ] Spelling errors
• [ ] Consistent capitalization
• [ ] Consistent numbers
• [ ] Material features incorrectly implemented: search for code blocks and markers (e.g. !!!).
• [ ] Code snippets don't work
• [ ] Images not working
• [ ] Links not working

Where it was tested

• Github Codespaces - 2-core, 4GB RAM, 32GB hard drive
• devcontainer.json describes further settings