Oh I see. It was that simple.
I'm trying to make a gradient in a square that necessarily reaches my desired color at the edges (not necessarily exactly at the edges, although not outside them). The radial mode is almost doing what I desire, but I need the inverse. So basically, is there a way to invert the gradient tool's radial setting? Is there a way to force a gradient to reach a specific color at a specific point / selection / area within a selection?