How can I change background color to gray? And Make unlimeted Level Menu, to go down?

[fhbash]

trafficstars

How can I change background color to gray? And Make unlimeted Level Menu, to go down? Not do to the left.

Thanks

[kzelda]

@fellipeh : Start GoogleChrome ==> F12 ==> Select background ==> Change it

[fhbash]

@kzelda : I tried before, but I want to change all dark theme, to one more like gray... I thought there is more a easy way to do that.

About my other question, about menu. any thoughts?

Cheers