I guess, at this point, I have bootstrap down to a science. I've set it up to use as a framework from which I can build WordPress themes, for example.
However, there is one little thing: The nav button that appears when the navigation transforms itself to a mobile nav. I can change change the basic color, the lines within (or add an icon), position it. BUT when it comes to making the button TRANSPARENT, i.e. no color, or emboss highlights (the intent is to have only the little lines visible), I hit a wall. It seems to inherit some styles from buttons in general. So I get a gray background. If I try, thru targeted CSS to kill the gray, I get to the point to where any color starts to slide up within the button to reveal another underlying gray. Weird stuff.
