Mobile menu collides with rest of website

hey guys -

My website is all good to go, but on mobile, the menu gets all messed up.

When you click on the 3 lines, the menu drops down and collies with the rest of the website.

How do i fix this to look clean? is the actual website.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

Hey @Ash_fish

Honestly, I would just make it full width, add a background color, and let 'er rip.

but what what about it covering the header?