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I haven’t verified this, but you might try:
from captcha.fields import CaptchaField, CaptchaTextInput
class RegisterForm(UserCreationForm):
captcha=CaptchaField(widget=CaptchaTextInput(attrs={'class': 'form-control'}))
Not sure if widget_tweaks plays nicely with MultiValueFields, but you could also try in your templates.
{% render_field form.captcha class+="form-control" %}
(Note the += rather than =)
Or, again using widget_tweaks
{{ form.captcha|add_class:"form-control" }}
Source:stackexchange.com