Drop down menu to fade up with no movement

When the drop down menu is activated the sequence is ugly and clunky and not in any way smooth. I would much prefer it if the background faded up to the semi black opacity, as it currently does, but but for the navigation titles to fade up top to bottom so no dropping down movement. Exactly as it does in the mobile view on this reference site www.dfmexico.co.uk.


Here is my site Read-Only: https://preview.webflow.com/preview/wingstop-424042?utm_source=wingstop-424042&preview=c396238cc21ff94f9c01fc89f9c9574e
(how to share your site Read-Only link)

Did you ever get this issue worked out?