Hi there,
How do I change the colour of the Previous/Mark this unit complete/Next navigation bar in the course? Is there a way to do it via the Appearance -> Customize section?
@lightswitch,
Yes, Go to wp-admin > Appearance > Customize > Body > Single Menu Dark Background Color
refer: http://prntscr.com/kwwqo8
But it will customize other areas as well.
So if you want for that particular nav bar then paste this custom css in custom css section
of customizer
.unit_prevnext {background:#ff0000 !important}
You can change the hex colr code also