Helix ultimate 2.0.17
impossible to apply a transparent background color to the #sp-header (whatever I do, I always have a white background) and in preset1.css, I cannot apply rgba(0, 0, 0, 0.1) for example
sp-header .header-sticky is OK (black background)
I cleared the browser cache
Can you help me please .
I have the same problem on Helix3 (always a white background)