I'm coding my pet's profile and I want to know how to make the description text fade in/out slowly?

It's a CSS3 Transition effect, you can read on it in [this] under one of the spoilers. I also recommend site called w3schools?

I used the code, only I used 0.8 instead of 0.5 (on this profile).

It fades in fine, but it won't fade out

Put it in the part without 'hover'

Whoops, gee I feel dumb now :P

Thanks for the help :)