Puzzle: correct solution glyph not affected by board brightness setting

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Exact URL of where the bug happened

https://lichess.org/training

Steps to reproduce the bug

1. Set board brightness to less than the default in the top right menu
2. Solve a puzzle

What did you expect to happen?

The glyph should be dimmed like the rest of the board/pieces.

What happened instead?

The glyph is not dimmed. In fact, it is seemingly the only element on the site using bright/white contours.

Operating system

macOS

Browser and version (or alternate access method)

Firefox

Additional information

Further issues:

• the shade of green does not match the other green elements of the UI.
• the glyph appears before the piece finished moving which also looks weird.

Please also consider allowing to disable the puzzle glyphs altogether in the settings! They don't add any information/value, I find them rather just distracting/annoying... Especially the "wrong move" one is visible for a fraction of a second at most, adding a weird sudden "blinking" to the otherwise calm site.