Gray space at the top on mobile

Hello, Im working with the story theme in wordpress. I’m using the full-page slider as my welcome page. I’ve inserted an image of a black background. When viewed from a pc it’s fine but when I view it on a mobile device there is a thin gray space at the top of my page. I know it has something to do with the margin or padding css but I can’t seem to figure it out with my chrome inspector tool. I’ve added tons of custom css to this site so I’m almost positive that it happed because of my doing. I know it’s an easy fix. It’s driving me absolutely nuts. Can anyone help? The link to my website is:

https://www.dorianlatelle.com