diff --git a/input/forms.py b/input/forms.py
index 0d88ca3..37414c1 100644
--- a/input/forms.py
+++ b/input/forms.py
@@ -9,7 +9,13 @@ from .models import Project, Volunteer, Extern, IFG, Library, TYPE_CHOICES,\
 from .settings import DATAPROTECTION, FOERDERRICHTLINIEN, NUTZUNGSBEDINGUNGEN
 
 
-class ProjectForm(ModelForm):
+
+class FdbForm(ModelForm):
+    '''this base class provides the required css class for all forms'''
+    required_css_class = 'required'
+
+
+class ProjectForm(FdbForm):
 
     # start = DateField(widget=AdminDateWidget())
 
@@ -20,7 +26,7 @@ class ProjectForm(ModelForm):
         widgets = {'start': AdminDateWidget(),
                    'end': AdminDateWidget(),}
 
-class ExternForm(ModelForm):
+class ExternForm(FdbForm):
 
     choice = ChoiceField(choices=TYPE_CHOICES.items(), widget=RadioSelect,
                          label='Was möchtest Du beantragen?')
@@ -37,7 +43,7 @@ INTERN_CHOICES = {'PRO': 'Projektsteckbrief',
                   'HON': 'Ehrenamtsbescheinigung, Akkreditierung oder Redaktionsbestätigung',
                   'TRAV': 'Reisekostenerstattung'}
 
-class InternForm(ModelForm):
+class InternForm(FdbForm):
     choice = ChoiceField(choices = INTERN_CHOICES.items(), widget=RadioSelect,
                          label = 'Was möchtest Du eingeben?')
 
@@ -45,7 +51,7 @@ class InternForm(ModelForm):
         model = Volunteer
         exclude = ('granted', 'granted_date', 'survey_mail_send')
 
-class TravelForm(ModelForm):
+class TravelForm(FdbForm):
     # TODO: add some javascript to show/hide other-field
     class Meta:
         model = Travel
@@ -53,28 +59,28 @@ class TravelForm(ModelForm):
         widgets = {'checkin': AdminDateWidget(),
                    'checkout': AdminDateWidget(),}
 
-class LibraryForm(ModelForm):
+class LibraryForm(FdbForm):
 
     class Meta:
         model = Library
         fields = ['cost', 'library', 'duration', 'notes']
 
-class IFGForm(ModelForm):
+class IFGForm(FdbForm):
     class Meta:
         model = IFG
         fields = ['cost', 'url', 'notes']
 
-class HonoraryCertificateForm(ModelForm):
+class HonoraryCertificateForm(FdbForm):
     class Meta:
         model = HonoraryCertificate
         fields = ['request_url', 'project']
 
-class LiteratureForm(ModelForm):
+class LiteratureForm(FdbForm):
     class Meta:
         model = Literature
         fields = ['cost', 'info', 'source', 'notes']
 
-class EmailForm(ModelForm):
+class EmailForm(FdbForm):
     # TODO: add some javascript to show/hide other-field
     check = BooleanField(required=True,
                          label=format_html("Ich stimme den <a href='{}'>Nutzungsbedingungen</a> zu",
@@ -84,12 +90,12 @@ class EmailForm(ModelForm):
         model = Email
         fields = ['domain', 'address', 'other']
 
-class BusinessCardForm(ModelForm):
+class BusinessCardForm(FdbForm):
     class Meta:
         model = BusinessCard
         fields = ['project', 'data', 'variant', 'sent_to']
 
-class ListForm(ModelForm):
+class ListForm(FdbForm):
     class Meta:
         model = List
         fields = ['domain', 'address']
diff --git a/input/templates/input/extern.html b/input/templates/input/extern.html
index dea31f5..f8d051c 100644
--- a/input/templates/input/extern.html
+++ b/input/templates/input/extern.html
@@ -21,6 +21,10 @@
     ul {
       padding-left: 10;
     }
+    label.required::after {
+      content: ' *';
+      color: red;
+    }
   </style>
 
   <img src="{% static 'input/logo.png' %}" />
@@ -38,6 +42,8 @@
     {{ wizard.form }}
   {% endif %}
   </table>
+  <p>
+    <span style="color: red">*</span> Pflichtfeld
   <p>
   {% if wizard.steps.prev %}
   <button formnovalidate="formnovalidate" name="wizard_goto_step" type="submit" value="{{ wizard.steps.prev }}">Zurück</button>