[Modification] Darker lunchtime area

Hi There,
I'm looking for a bit of advice regarding a largely cosmetic modification: a shaded out lunchtime area. I've attached a quick mock-up of what I mean.
I expect that there is no straightforward way to do this, but I thought I'd just check if anyone else has done this successfully, or has any ideas?
thanks!
I'm looking for a bit of advice regarding a largely cosmetic modification: a shaded out lunchtime area. I've attached a quick mock-up of what I mean.
I expect that there is no straightforward way to do this, but I thought I'd just check if anyone else has done this successfully, or has any ideas?
thanks!