In March, we launched a redesign of Khan Academy where we gave the world the gift of color! 
As you meander about Khan Academy, you’ll see that each domain’s color scheme permeates all the way through. For example, “Discoveries and projects“ falls under science, so it’s pink.
Instead of copying and pasting domains + colors everywhere, we used LESS variables and mixins.
More specifically, we did something like this gist 
As a fun demo, open some science page and then do this in the console:
and you’ll see the theme switch just like that!
 – Where Jason and Tabitha both blogged about it
 – I should figure out how to embed gists some time. Or move off of wordpress.You can leave a response, or trackback from your own site.