You can turn it off, under My Account -> Online Chess Settings -> Move Preferences.
Too strong color contrast on the chess board
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Oh, thank you man.
Dang, maybe I was happy too soon?! Disabling doesn't work for some reason in live games... :(
Hmm, do I need to be premium member to be able disable it?
You can turn it off but I forgor
HOW DO YOU TURN IT OFF 
(((
I didn't check all the history topics in this forum about this issue, so I don't know if it was already discussed or not. Namely, I think that is the color contrast on the board too strong, or more precisely, blue quares that mark the last moves on the brown (yellow) background makes too strong color contrast and that makes playing experience annoying after a while. So I would like to have an option to change that color or an option to disable it altogether (i remember my last move usually :). The only more annoying color combination that I can imagine is red in the green background.
Anyone else agree with me?