CSS Files Location

You can do some styles on the tag below:
.jfbcLogin a {}

For appearing in the center of a line, you can try: text-align:center That doesn't always work though, depending on the column or area the button's been defined in.

You may not be able to style everything exactly how you want. Facebook includes its own styles with that button, and not all can be overridden. It is also possible to use your own image for the button, or just a simple text link. If you'd prefer to do that, just let us know, and we can tell you how.

Hope that helps,
Alex