Register Plus – Text color hides in background on page after registration

After a user registers on my site, they are directed to this page: http://albertatalks.ca/wp-login.php?checkemail=registered

If you highlight the area in the square box you will see “Please activate your account using the verification link sent to your email address.”

I just want to change the text colour so it is viewable. I know this is probably quite simple, but it seems that I cant change anything without the script buggering up.

If there is an easier solution than changing the color, let me know too.

Any help?