change text color in the like button

Unfortunately it isn’t possible to change the text color since that’s a frame loading from Facebook. The issue is primarily that the frame background is transparent. There are several issues with this approach in general, though, as things really don’t work when using a dark frame color either. There just aren’t a lot of options with Facebook, while some the other networks have direct-link capabilities (like what QuickShare does with sharing).

The solution is to add a background color to the Facebook like popup, this should work:

#fsml_fblikemodal {
    background: rgba(255,255,255,.6);
}
#fsml_fblikemodal a {
    color: #555;
}

This basically sets the background color of that popup frame and changes the link color in it (the close link) so that it’s legible against the lighter background. I just used a semi-transparent color in that example so that this css should work okay for anyone with this issue; you could pick more specific colors to go with your site too if you want but I think it looks fine with these too.