--- a/src/pyams_content/shared/site/zmi/link.py	Tue Dec 04 16:12:46 2018 +0100
+++ b/src/pyams_content/shared/site/zmi/link.py	Tue Dec 04 17:48:49 2018 +0100
@@ -95,6 +95,8 @@
         super(ContentLinkAddForm, self).updateWidgets(prefix)
         if 'parent' in self.widgets:
             self.widgets['parent'].permission = CREATE_CONTENT_PERMISSION
+        if 'navigation_header' in self.widgets:
+            self.widgets['navigation_header'].widget_css_class = 'input height-100'
 
     def create(self, data):
         return ContentLink()
@@ -149,6 +151,11 @@
     fields = field.Fields(IContentLink).select('reference', 'navigation_title', 'navigation_header')
     edit_permission = MANAGE_CONTENT_PERMISSION
 
+    def updateWidgets(self, prefix=None):
+        super(ContentLinkPropertiesEditForm, self).updateWidgets(prefix)
+        if 'navigation_header' in self.widgets:
+            self.widgets['navigation_header'].widget_css_class = 'input height-100'
+
     def get_ajax_output(self, changes):
         output = super(self.__class__, self).get_ajax_output(changes)
         intids = get_utility(IIntIds)
@@ -210,6 +217,8 @@
         super(ExternalContentLinkAddForm, self).updateWidgets(prefix)
         if 'parent' in self.widgets:
             self.widgets['parent'].permission = CREATE_CONTENT_PERMISSION
+        if 'navigation_header' in self.widgets:
+            self.widgets['navigation_header'].widget_css_class = 'input height-100'
 
     def create(self, data):
         return ExternalContentLink()
@@ -264,6 +273,11 @@
     fields = field.Fields(IExternalContentLink).select('url', 'navigation_title', 'navigation_header')
     edit_permission = MANAGE_CONTENT_PERMISSION
 
+    def updateWidgets(self, prefix=None):
+        super(ExternalContentLinkPropertiesEditForm, self).updateWidgets(prefix)
+        if 'navigation_header' in self.widgets:
+            self.widgets['navigation_header'].widget_css_class = 'input height-100'
+
     def get_ajax_output(self, changes):
         output = super(self.__class__, self).get_ajax_output(changes)
         intids = get_utility(IIntIds)