Hiding menu when past 580px

I have an issue where the menu stays visible past the resolution set in the css. Is there a switch for it to be hidden when larger than 580?

Url: dev2.coventrycreations.com  

Hi
I have checked :
- the menu ID 336 is a mod_menu that is hidden in all resolutions and used for the mobile menu
- the menu that is shown over 580px is a DJ megamenu (another module), which is not related to the mobile menu

CEd

I'm getting the attached over lap when testing on the tablet. The dj mega menu and other modules should be visible past the 580px. Howdo I correct that overlap?

this comes from your template in the mobile.css file

body {
    padding: 10px 5px 30px 5px !important;
}

you must remove that, because it overrites the mobile menu css that adds a padding top of 40px