Does anyone know of any testing / studies with evidence that Google prefers dark text on a light background vs. light text on a dark background? I have a website that currently has light text on a black background, and really like the way it looks, but am concerned that the style may be hurting SEO. Moreover, redesigning something inverse with the same quality would be a large project and fairly costly, so I'd like to make sure the benefit will really be worth the cost before moving forward.