Hello,
Please go to Theme Options > Styling > Customize buttons. For example – http://prntscr.com/noezhz > http://prntscr.com/noez8d http://prntscr.com/nof0ca http://prntscr.com/nof0nb
Go to Plugins > http://prntscr.com/nof2t8 > http://prntscr.com/nof34c
Don’t forget to clear cache before checking the result.
Regards