diff --git a/admin_interface/models.py b/admin_interface/models.py
index 82921f0..2dc4405 100644
--- a/admin_interface/models.py
+++ b/admin_interface/models.py
@@ -51,39 +51,39 @@ class Theme(models.Model):
     active = models.BooleanField( default = True )
 
     title = models.CharField( max_length = 50, default = 'Django administration', blank = True )
-    title_color = ColorField( blank = True, default = '#F5DD5D', help_text = '#F5DD5D', verbose_name = 'title color' )
+    title_color = ColorField( blank = True, default = '#F5DD5D', help_text = '#F5DD5D', max_length = 10, verbose_name = 'title color' )
     title_visible = models.BooleanField( default = True, verbose_name = 'visible' )
 
     logo = models.FileField( upload_to = 'admin-interface/logo/', blank = True, help_text = '(leave blank to use the default Django logo)' )
-    logo_color = ColorField( blank = True, default = '#FFFFFF', help_text = '#FFFFFF', verbose_name = 'logo color' )
+    logo_color = ColorField( blank = True, default = '#FFFFFF', help_text = '#FFFFFF', max_length = 10, verbose_name = 'logo color' )
     logo_visible = models.BooleanField( default = True, verbose_name = 'visible' )
 
-    css_header_background_color = ColorField( blank = True, default = '#0C4B33', help_text = '#0C4B33', verbose_name = 'background color' )
-    css_header_text_color = ColorField( blank = True, default = '#44B78B', help_text = '#44B78B', verbose_name = 'text color' )
-    css_header_link_color = ColorField( blank = True, default = '#FFFFFF', help_text = '#FFFFFF', verbose_name = 'link color' )
-    css_header_link_hover_color = ColorField( blank = True, default = '#C9F0DD', help_text = '#C9F0DD', verbose_name = 'link hover color' )
+    css_header_background_color = ColorField( blank = True, default = '#0C4B33', help_text = '#0C4B33', max_length = 10, verbose_name = 'background color' )
+    css_header_text_color = ColorField( blank = True, default = '#44B78B', help_text = '#44B78B', max_length = 10, verbose_name = 'text color' )
+    css_header_link_color = ColorField( blank = True, default = '#FFFFFF', help_text = '#FFFFFF', max_length = 10, verbose_name = 'link color' )
+    css_header_link_hover_color = ColorField( blank = True, default = '#C9F0DD', help_text = '#C9F0DD', max_length = 10, verbose_name = 'link hover color' )
 
-    css_module_background_color = ColorField( blank = True, default = '#44B78B', help_text = '#44B78B', verbose_name = 'background color' )
-    css_module_text_color = ColorField( blank = True, default = '#FFFFFF', help_text = '#FFFFFF', verbose_name = 'text color' )
-    css_module_link_color = ColorField( blank = True, default = '#FFFFFF', help_text = '#FFFFFF', verbose_name = 'link color' )
-    css_module_link_hover_color = ColorField( blank = True, default = '#C9F0DD', help_text = '#C9F0DD', verbose_name = 'link hover color' )
+    css_module_background_color = ColorField( blank = True, default = '#44B78B', help_text = '#44B78B', max_length = 10, verbose_name = 'background color' )
+    css_module_text_color = ColorField( blank = True, default = '#FFFFFF', help_text = '#FFFFFF', max_length = 10, verbose_name = 'text color' )
+    css_module_link_color = ColorField( blank = True, default = '#FFFFFF', help_text = '#FFFFFF', max_length = 10, verbose_name = 'link color' )
+    css_module_link_hover_color = ColorField( blank = True, default = '#C9F0DD', help_text = '#C9F0DD', max_length = 10, verbose_name = 'link hover color' )
     css_module_rounded_corners = models.BooleanField( default = True, verbose_name = 'rounded corners' )
 
-    css_generic_link_color = ColorField( blank = True, default = '#0C3C26', help_text = '#0C3C26', verbose_name = 'link color' )
-    css_generic_link_hover_color = ColorField( blank = True, default = '#156641', help_text = '#156641', verbose_name = 'link hover color' )
+    css_generic_link_color = ColorField( blank = True, default = '#0C3C26', help_text = '#0C3C26', max_length = 10, verbose_name = 'link color' )
+    css_generic_link_hover_color = ColorField( blank = True, default = '#156641', help_text = '#156641', max_length = 10, verbose_name = 'link hover color' )
 
-    css_save_button_background_color = ColorField( blank = True, default = '#0C4B33', help_text = '#0C4B33', verbose_name = 'background color' )
-    css_save_button_background_hover_color = ColorField( blank = True, default = '#0C3C26', help_text = '#0C3C26', verbose_name = 'background hover color' )
-    css_save_button_text_color = ColorField( blank = True, default = '#FFFFFF', help_text = '#FFFFFF', verbose_name = 'text color' )
+    css_save_button_background_color = ColorField( blank = True, default = '#0C4B33', help_text = '#0C4B33', max_length = 10, verbose_name = 'background color' )
+    css_save_button_background_hover_color = ColorField( blank = True, default = '#0C3C26', help_text = '#0C3C26', max_length = 10, verbose_name = 'background hover color' )
+    css_save_button_text_color = ColorField( blank = True, default = '#FFFFFF', help_text = '#FFFFFF', max_length = 10, verbose_name = 'text color' )
 
-    css_delete_button_background_color = ColorField( blank = True, default = '#BA2121', help_text = '#BA2121', verbose_name = 'background color' )
-    css_delete_button_background_hover_color = ColorField( blank = True, default = '#A41515', help_text = '#A41515', verbose_name = 'background hover color' )
-    css_delete_button_text_color = ColorField( blank = True, default = '#FFFFFF', help_text = '#FFFFFF', verbose_name = 'text color' )
+    css_delete_button_background_color = ColorField( blank = True, default = '#BA2121', help_text = '#BA2121', max_length = 10, verbose_name = 'background color' )
+    css_delete_button_background_hover_color = ColorField( blank = True, default = '#A41515', help_text = '#A41515', max_length = 10, verbose_name = 'background hover color' )
+    css_delete_button_text_color = ColorField( blank = True, default = '#FFFFFF', help_text = '#FFFFFF', max_length = 10, verbose_name = 'text color' )
 
     css = models.TextField( blank = True )
 
     related_modal_active = models.BooleanField( default = True, verbose_name = 'active' )
-    related_modal_background_color = ColorField( blank = True, default = '#000000', help_text = '#000000', verbose_name = 'background color' )
+    related_modal_background_color = ColorField( blank = True, default = '#000000', help_text = '#000000', max_length = 10, verbose_name = 'background color' )
     related_modal_background_opacity_choices = (
         (0.1, '10%', ),
         (0.2, '20%', ),