REQUEST: change background of this forum

I would kindly like to ask for a change in the background graphic of this forum

Right now it has horizontal lines- and so when I zoom in and out in Firefox [54.0], adjusting the size of the whole site, problems with scaling of graphics occur. I just get all kinds of horizontal artifacts, which are simply distracting when scrolling through threads

Change background color too please.
I mostly chance that ugly orange to white.
(Firefox -> F12 -> right window -> uncheck body background -> F12 to close editing)