New UI Run widget color customization
Answered
I like the new design for the "New UI Beta" for the most part but there is one button that strikes me as too much colorful and bold. The main color for the "Run Widget" is blue but I would like to customize it to be dark grey, green for the play icon and red for the debug one. Is there any way for me to perform such customization? 
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Please see https://youtrack.jetbrains.com/issue/IDEA-294719/Run-widget-is-too-bright.
This was the only distinguishing feature that sets the new ui apart from the classic. Don't get why many people have complaint about it and made intellij remove it. Quite a shame!