Search Modal comes up at back of video and not in front

[Jolene]

Hi there

On my index page I have a video and a button with a magnifying glass to search with.  If you click on this button a "Search Modal" comes up where you can make your selection of what to search for.  But this "Search Modal" keeps coming up at the back of the video.  How do I get it to come to the front ??

Please please help.

Jolene