Create custom form for signup using UserCreationForm

user_creation_form.py

class myUserCreationForm(UserCreationForm):
  #additional fields
  class Meta:
      model = User
      fields = ('username', 'password1', 'password2')

  def __init__(self, *args, **kwargs):
      super(UserCreationForm, self).__init__(*args, **kwargs)
      
      #set classes for css
      self.fields['username'].widget.attrs['class'] = 'form-control'
      self.fields['password1'].widget.attrs['class'] = 'form-control'
      self.fields['password2'].widget.attrs['class'] = 'form-control'