Hi. I'm trying to creat a sticky NavBar that houses the company's logo and a couple of other simple elements, in white. When the page loads, I'd like the elements to appear, but the background to have 0% opacity. When the user starts scrolling down the page however, I'd like to have the effect that the NavBar background blends to a black background. I've tried everything I can think of, but I can't seem to achieve this effect. Is it possible? Is there a suitable workaround that anyone can think of, if it's not? Thanks so much, in advance!