Remove class="custom" from form, it has strange behaviours...

(Adding a width=18px in the small.error onchange, for example.
See: https://github.com/yohanboniface/django-leaflet-storage/issues/33)

youmap/templates/leaflet_storage/feature_form.html

@@ -1,5 +1,5 @@
 {% load youmap_tags i18n %}
-<form method="post" action="{{ action }}" id="feature_form" onsubmit="return false;" class="custom">
+<form method="post" action="{{ action }}" id="feature_form" onsubmit="return false;">
     {% csrf_token %}
     {{ form.no_field_errors }}
     {% foundation_field form.name %}