Set vertex outline width attribute

I would like to set the outline thickness of vertices to be thicker than originally shown. I cannot find any list of attributes for how to change the graph visualization. Documenting this list would be very useful.

Essentially I wanted to do this, but cannot find the attribute name.

g.vs['outline_thickness'] = 2

It is called frame_color and it is documented along with all the other styling options in the __plot__ method of the Graph object (this is where the execution eventually ends up if you call plot(g) on a graph):