If FancyCaptcha generated fixed-size images (at least as an option), it would be easier to style/position the resulting image in layouts.
Right now, the height and width both vary.
ReCAPTCHA seems to do this. It looks like it's always 300x57 with two words.
Version: master
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=46759