diff --git a/evapp/forms.py b/evapp/forms.py
index bf0ffc9..01fe604 100644
--- a/evapp/forms.py
+++ b/evapp/forms.py
@@ -10,12 +10,16 @@ from .models import Employee
 #         widgets = {'firstdate_employment': DateInput(attrs={'type': 'date'}),
 #                    'firstdate_presence': DateInput(attrs={'type': 'date'}),}
 
-class PersonalForm(ModelForm):
+class FdbForm(ModelForm):
+    '''this base class provides the required css class for all forms'''
+    required_css_class = 'required'
+
+class PersonalForm(FdbForm):
     class Meta:
         model = Employee
         fields = ['firstname', 'lastname', 'email', 'department', 'team',]
 
-class WorkingForm(ModelForm):
+class WorkingForm(FdbForm):
     class Meta:
         model = Employee
         fields = ['firstdate_employment', 'firstdate_presence', 'jobdescription_german',
@@ -23,14 +27,14 @@ class WorkingForm(ModelForm):
         widgets = {'firstdate_employment': DateInput(attrs={'type': 'date'}),
                    'firstdate_presence': DateInput(attrs={'type': 'date'}),}
 
-class ITForm(ModelForm):
+class ITForm(FdbForm):
     class Meta:
         model = Employee
         fields = [
             'laptop', 'os', 'screen', 'mobile', 'landline', 'comment',
             'language', 'accounts', 'lists', ]
 
-class OfficeForm(ModelForm):
+class OfficeForm(FdbForm):
     class Meta:
         model = Employee
         fields = ['transponder', 'post_office_box',]