[code-reflection] RFR: MNISTDemo UI tweak [v2]

[Paul Sandoz]

On Mon, 24 Feb 2025 19:57:24 GMT, Adam Sotona <asotona at openjdk.org> wrote:

>> MNISTDemo UI adjusted.
>> 
>> ![screenshot](https://github.com/user-attachments/assets/e0054126-45e5-4eec-bf2d-707475dfc5b1)
>
> Adam Sotona has updated the pull request incrementally with one additional commit since the last revision:
> 
>   added colors

Marked as reviewed by psandoz (Lead).

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PR Review: https://git.openjdk.org/babylon/pull/327#pullrequestreview-2638477372