diff --git a/modoboa/extensions/admin/forms/account.py b/modoboa/extensions/admin/forms/account.py
index 7c7e89e35..8fbba9170 100644
--- a/modoboa/extensions/admin/forms/account.py
+++ b/modoboa/extensions/admin/forms/account.py
@@ -135,7 +135,7 @@ class AccountFormGeneral(forms.ModelForm):
 
 
 class AccountFormMail(forms.Form, DynamicForm):
-    email = forms.EmailField(label=ugettext_lazy("E-mail"), required=False)
+    email = forms.EmailField(label=ugettext_lazy("E-mail"), required=False, widget=forms.TextInput(attrs={"class": "form-control"}))
     quota = forms.IntegerField(
         label=ugettext_lazy("Quota"),
         required=False,
@@ -153,7 +153,8 @@ class AccountFormMail(forms.Form, DynamicForm):
             "Alias(es) of this mailbox. Indicate only one address per input, "
             "press ENTER to add a new input. Use the '*' character to create "
             "a 'catchall' alias (ex: *@domain.tld)."
-        )
+        ),
+        widget=forms.TextInput(attrs={"class": "form-control"})
     )
 
     def __init__(self, *args, **kwargs):
diff --git a/modoboa/extensions/admin/forms/alias.py b/modoboa/extensions/admin/forms/alias.py
index a16b14257..9de56daed 100644
--- a/modoboa/extensions/admin/forms/alias.py
+++ b/modoboa/extensions/admin/forms/alias.py
@@ -17,14 +17,16 @@ class AliasForm(forms.ModelForm, DynamicForm):
         help_text=ugettext_lazy(
             "The distribution list address. Use the '*' character to create a "
             "'catchall' address (ex: *@domain.tld)."
-        )
+        ),
+        widget=forms.TextInput(attrs={"class": "form-control"})
     )
     recipients = forms.EmailField(
         label=ugettext_lazy("Recipients"), required=False,
         help_text=ugettext_lazy(
             "Mailbox(es) this alias will point to. Indicate only one address "
             "per input, press ENTER to add a new input."
-        )
+        ),
+        widget=forms.TextInput(attrs={"class": "form-control"})
     )
 
     class Meta:
diff --git a/modoboa/extensions/amavis/app_settings.py b/modoboa/extensions/amavis/app_settings.py
index d1feef65d..1d9c9f976 100644
--- a/modoboa/extensions/amavis/app_settings.py
+++ b/modoboa/extensions/amavis/app_settings.py
@@ -76,7 +76,8 @@ class ParametersForm(AdminParametersForm):
     notifications_sender = forms.EmailField(
         label=_("Notifications sender"),
         initial="notification@modoboa.org",
-        help_text=_("The e-mail address used to send notitications")
+        help_text=_("The e-mail address used to send notitications"),
+        widget=forms.TextInput(attrs={"class": "form-control"})
     )
 
     visibility_rules = {