I didn't change my color bars but I did change the color of the menu bars for mobile so they would better show against the dark bar.
In the template stlyesheet_colors.css I cut from up top around end of line#3 where it is in a long list of things to be similarly colored, then I pasted it near the bottom, just before '/*bof placeholders*/' on its own with its own color, in my case white. Changing the color in original position would also have changed many other things to that color.
Code:
.header .fa-bars {color:#ffffff;}
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