How in DJANGO create editable select field as in the picture below?

I used before django-floppyforms app in my project. It use datalist which is unflexibility in css styling. So is it possible replace detalist to ul, li elements?

forms.py:

CharacteristicForm(forms.ModelForm):
    user_class = floppyforms.CharField(
       widget=floppyforms.TextInput(
          datalist=['A', 'B', 'C'],
          attrs={'autocomplete': 'off',}
       )
    )

    class Meta:
        model = Characteristic
        fields = ('user_class')