I have used FlexSlider to place a text-only Views slideshow over the top of a header with a video background.

For some reason, there is a block of solid black just before the slideshow starts. It is visible for however long the slideshow takes to load. Half a second, a second.

We have two websites that have this issue.

I hunted through the CSS but there is nothing to cause a backround-colour of #000 or similar.

I just want to get rid of the black before the slideshow starts. Make it transparent.

Any help would be greatly appreciated.