Is there any way to have a semi-transparent top bar with Zurb Foundation?
I have defined all the relevant variables, from what I can tell, in my _settings.scss file:
$topbar-bg-color
$topbar-bg
$topbar-dropdown-bg
$topbar-dropdown-link-bg
$topbar-dropdown-label-bg
And have tried all number of variations (of rgba's with alpha values from 0-0.5) and have always ended up with either a fully transparent bar or a semi-transparent bar with the dropdowns/buttons stacking their background on top and thus appearing darker/more opaque.

Is there any way to have a topbar that is semi-transparent throughout?
I can see in the stylesheet that .top-bar-section li a:not(.button) is always getting a background colour. I know I could manually override this in my own stylesheet, but I feel like there must be a way to setup the variables so these buttons don't appear darker?