I'm working in Moodle 2.6 and using the Essential theme. I'm trying to change the color of all of the submit buttons (those in lessons, quizzes, etc) in the course I'm developing so that they are black with white writing. This is the CSS I am using, but they keep appearing as white buttons with black writing.
I have trying playing around with this CSS in a variety of different ways, and the buttons keep appearing the same. What am I doing wrong?