Using SI Captcha 2.6.4, I was able to set a CSS class name for options like "CAPTCHA input label" and "CAPTCHA input label". This functionality was mentioned in the plugin on-screen help. Great! That is exactly what I needed and it worked well.
Then I upgraded to SI Captcha 2.7 in order to get other improvements. Now the ability to use 'class="classname"' in those fields above, seems to have been removed - even the plugin help no longer mentions that possibility :-( So this seems to be a deliberate change, but checking the changelog I didn't see this change mentioned or explained.
Adding the (long!) CSS for these fields manually in the SI Captcha options isn't a great workaround - the manually-entered CSS is loaded right at the bottom of the HTML page by the plugin, so the CAPTCHA field appears first without that CSS styling, then loads the syling a moment later when the browser loads it, which looks strange.
Why was the ability to enter CSS class names into those plugin options fields removed, and can this ability be re-added, like it was in 2.6.4?