Color Progress Bar

I am using oC 8.2.7 and trying to customise the color of the progress bar when uploading files. I already changed the colors for header, login-background in the theme/core/css. I also tried to find the color code for the progress bar in the .../apps/files/css/upload.css but could not find it. Tried to put in backgrpund color and color code but doe not work. Is somebody out there who know how to change the color?


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