title: Style Django form error message
body: <p>I'm trying to make django form defa error red and bold. For example, make "This field is required" red and bold. I saw error_css_class = 'error' but it's not working. 
  <a href="https://docs.djangoproject.com/en/1.5//ref/forms/api/#django.forms.Form.error_css_class" rel="nofollow">https://docs.djangoproject.com/en/1.5//ref/forms/api/#django.forms.Form.error_css_class</a>
  Thank you!
  This is my models.py</p>
  
  <pre><code>class RegiForm(forms.Form):
      error_css_class = 'error'
      DateInput = partial(forms.DateInput, {'class': 'datepicker'})
      email = forms.EmailField(max_length=75)
      first_name = forms.CharField(max_length=25)
      last_name = forms.CharField(max_length=25)
      address = forms.CharField(max_length=200)
  </code></pre>
  
  <p>This is my template:</p>
  
  <pre><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"&gt;
      &lt;head&gt;
          &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /&gt;
          &lt;title&gt;RegistrationForm&lt;/title&gt;
      &lt;/head&gt;
      &lt;body&gt;
          &lt;h1&gt;Registration Form&lt;/h1&gt;
          &lt;form action="/login/regi/" method="POST"&gt;
              {% csrf_token %}
              {{ form.as_p }}
              &lt;input type="submit" value="Submit" /&gt;
          &lt;/form&gt;
      &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>