Correct me if I'm wrong, but "scroll to bottom" round button in history now shares its color with windowBg (one of main colors).
In history.style file there're only options to change foregound (the icon inside that button), they're present in palette as menuIconFg and menuIconFgOver.
There's also key for button's shadow (historyToDownShadow), but nothing for background (default and on hover).
Am I missing something? It would be very nice to allow us change its color.

Version of Telegram Desktop: 1.0
Yes it seems. Seen that.

Even the hover color

@luckydonald on the first screenshot (no hover) the color of the button is changes, but it's the same as the color of the panel below. I've never seen a theme with "scroll to bottom" button having completely another color.
@MasterGroosha I think they could be separated, yes.
This is fixed in 041e366df7aa16c498ae8ccf7171405ec20a5e70 . Thank you!
Most helpful comment
This is fixed in 041e366df7aa16c498ae8ccf7171405ec20a5e70 . Thank you!