add html default background-color and text color

I don't run any test on this. So if someone has setup everything to have a short look at it, would be nice :thumbsup: 

Why I made this fix:

![2014-06-27--1403891580_1600x900](https://cloud.githubusercontent.com/assets/1682954/3416010/d88e7626-fe27-11e3-9c6a-1423670a21ec.png)