I’m pretty sure there is no option on the customize page to set transparency to any elements that have a background or color. I was able to achieve what I wanted with CSS but it would be SO AWESOME if that was already an option.
Also, it would be JUST AS AWESOME if we were able to set the navigation menu to “fixed” like all the other elements in the background section of customizer. Not just “repeat, repeat x, repeat y, and no repeat”.
All colors in the Customizer are removable, which achieves full transparency. But you’re right, there’s no partial transparency feature.
In order for colors to be semi transparent, an RGBA value must be set instead of a hex. In order for me to achieve this, I would have to find a way to convert hex values into RGBA – difficult, but may be possible at some point.
Ah yea, I wanted to cut down on the amount of options, and figured those were less needed for nav items vs everywhere else. I may have to add them 🙂