Personally, I do not like reading diagram on the computer screen. I am not sure the black background would make it better. I just read an article about inverting your browser color:
http://lifehacker.com/5912480/how-to-invert-your-browsers-colors-for-easier-reading-at-night I found some useful tricks: : Mac users: Command + Option + Control + 8 (big PLUS for iUsers) Windows users: Built-in Magnifer (several steps to setup) or f.lux (http://justgetflux.com/, I haven't tried it) The suggested browser solution (Firefox, Chrome extension) will not work for viewing embedded image or pdf files. Thanks, Sy
