I'm trying to make something similar to the background of this page. Something moves with the mouse on the background. I've tried recreating it but I just cant get it to look the same no matter how much blurring I use.
I believe it's a gradient. The inspector in Safari id'd it as "div.bg-move-grad" (1286px x 872px).
Search the "quiver-public.min.css" style sheet for the base term "bg-move" - lots of hits.