(adsbygoogle = window.adsbygoogle || []).push({}); Does anyone know how to get a background when you open the menu? not the whole screen just around the menu.

On 1.13, the only way to build a shader around your menu (that is the only way yet discovered) is to use the green box that you see in a lot of aim-assists. I forget what it is called exactly, it's like the debug box.
As for the box itself, I wouldn't know how to change the color of it. But you can use a vision over it.

Thanks I'll give it a try, do you know the background offset for online where "find a game" etc is before the search lobby and after you press "play online"

The zone file is just the weirdest thing to me so I don't even try modding it. There are threads for it though. Good luck.