Hi ReadCube users!
We understand that this is a really important feature for a lot of you, as white backgrounds do strain your eyes and are difficult to look at after long periods of time. This is definitely something we want to work on at some point and implement as an actual feature.
For now, I recommend giving http://justgetflux.com/ a shot, as it is designed to reduce eyestrain for your entire monitor and should function as an appropriate substitute for the time being.
Thanks so much for your patience and feedback!
AlexJithin Raj commented
I strongly support this. It is difficult to stare at white background for hours. Using antiglare glasses and reducing the screen brightness to minimum doesn't work better with white shiny background. Most often my eyes go tired on the fly. An eye friendly background will provide a cool 'healthy' reading experience.
3,898 votesJithin Raj commented
I support this. It will be more comfortable if highlights from readcube is visible in other pdf readers and vice versa. Different colours for highlighting can be a simple attractive feature too.