medvp3d on "[Theme: Twenty Thirteen] Location of code for compact mobile menu?"

That SORT of worked. But now it always shows the small menu even if I'm on a large screened browser, together with the regular menu

If I also copy from the style.css the part just below that, from line 2846 to 2849:
ul.nav-menu,
div.nav-menu > ul {
display: none;
}
then it takes the regular menu away and always shows the small menu.

I just need it to work like default, with the exception of changing the colours

Any thoughts?