Change flag icon position django-countries dropdown

Question

I am using the django-countries module to create a country selector in Django, but the flag appears underneath the selection field instead of in it. Flag icon appears underneath selection field

This is the code of forms.py:

class TweetForm(forms.ModelForm):
    class Meta:
        model = TweetSearch
        fields = ['search_term', 'query_type', 'start_date', 'end_date', 'language', 'country', 'tweet_count']
        widgets = {'country': CountrySelectWidget(attrs={'class': 'form-control'}),
        }

How do I change the flag position to inside the selection field?