Adding css class to field on validation error in django

Question

I am using Django\'s modelform and its really good. How can I highlight the actual text box (e.g. border:red ) if there is a validation error associated with it. Basically

Answer 1

What about defining error_css_class? http://docs.djangoproject.com/en/dev/ref/forms/api/#styling-required-or-erroneous-form-rows?

class MyForm(ModelForm):
    error_css_class = 'error'