white-ish (as suggested by juchanx3 and maxwell)
The header will change to the one made by juchanx3, just its up to Sudrien when that will take place.
Don't agree with the use of yellow and going further the white is tendency... how many sites do you know that have yellow backgrounds?
The one I made isn't exactly whiteish, this one is more
Also you could remove the pattern in the background or pick another https://www.toptal.com/designers/subtlepatterns/