Restyle the Slides

## Do you have an eye for design?
Help us improve the look of the slide deck.
If you need help, check out the Appendix in the training manual.

Locate the slide deck referenced by the issue and review the Appendix in the training manual before changing anything. Restyle the deck to improve its visual presentation, with the final appearance serving as the completion check; no specific files or tests are named.

由索引模型根据 Issue 内容生成。