old_contents: from django.contrib import admin
  from polls.models import Poll
  
  class PollAdmin(admin.ModelAdmin):
        fields = ['pub_date','question']
  
  admin.site.register(Poll, PollAdmin)
  
new_contents: from django.contrib import admin
  from polls.models import Poll
  
  class PollAdmin(admin.ModelAdmin):
       fieldsets = [
  	 (None, {'fields': ['question']}),
  	 ('Date information', {'fields':['pub_date'],
            'classes':    ['collapse']}),
       ] 	
  
  admin.site.register(Poll, PollAdmin)
  
subject: Customize the admin form -- split the form and adding HTML classes to fieldset