Sticky element behind other page elements

Hello!

This plugin is awesome, I have used it before, but I just can’t seem to get it to work on this site.

I have it installed on a website running Avada. I would like to make the row of buttons at the top sticky (to act like a secondary nav menu under the main menu when you scroll – these buttons are to anchor links on the page).

I have managed to get the row to stick, but it’s landing up behind all of the other elements on the page so you can’t see it as you scroll down the page.

Not sure how to fix this? Any help would be appreciated!

The page I need help with: [log in to see the link]