Audio prompt - did it change background color?


I've been working on this course that uses quite a bit of h5p since last summer. In the past when I added audio with the "full" setting and opacity at 0, it used to be black. Now it is suddenly white or transparent. If you have the opacity set at 100 it's white with squared edges. If you have it set at 0 it's also white but with rounded edges. 

Did that actually change for others? Something wonky with my computer? Just trying to figure that out. But annoyed because they don't match now throughout the course. And more importantly I guess - is there any way to change it back to having the black background?