Change Color of Short and Long Description fields in Backend

[hurray]

I am not sure if anyone here has tried to do this, but I would like to change the background color of the short and long descriptions fields on backend. My website used to have a dark background with white texts. These two fields were made to appear dark. But now I have changed the colors of my websites and would like to find out where I can change the colors of these fields to match the one on the front-end.

 

I am using 1.5.6.2 with a Reviver theme.