diff --git a/Resources/views/Form/bootstrap.html.twig b/Resources/views/Form/bootstrap.html.twig
index 930882f..0617024 100644
--- a/Resources/views/Form/bootstrap.html.twig
+++ b/Resources/views/Form/bootstrap.html.twig
@@ -87,7 +87,7 @@
             {% endif %}
             {% set prototype_html = '<div class="col-xs-' ~ form.vars.sub_widget_col ~ '">' ~ form_widget(prototype, prototype_vars) ~ '</div>' %}
             {% if form.vars.allow_delete %}
-                {% set prototype_html = prototype_html ~ '<div class="col-xs-' ~ form.vars.button_col ~ '"><a href="#" class="btn btn-danger btn-small" data-removefield="collection" data-field="__id__">' ~ form.vars.delete_button_text|trans({}, translation_domain)|parse_icons|raw ~ '</a></div>' %}
+                {% set prototype_html = prototype_html ~ '<div class="col-xs-' ~ form.vars.button_col ~ '"><a href="#" class="btn btn-danger btn-sm" data-removefield="collection" data-field="__id__">' ~ form.vars.delete_button_text|trans({}, translation_domain)|parse_icons|raw ~ '</a></div>' %}
             {% endif %}
             {% set prototype_html = '<div class="row">' ~ prototype_html ~ '</div>' %}
 
@@ -105,7 +105,7 @@
                             </div>
                             {% if form.vars.allow_delete %}
                                 <div class="col-xs-{{ form.vars.button_col }}">
-                                    <a href="#" class="btn btn-danger btn-small" data-removefield="collection" data-field="{{ field.vars.id }}">{{ form.vars.delete_button_text|trans({}, translation_domain)|parse_icons|raw }}</a>
+                                    <a href="#" class="btn btn-danger btn-sm" data-removefield="collection" data-field="{{ field.vars.id }}">{{ form.vars.delete_button_text|trans({}, translation_domain)|parse_icons|raw }}</a>
                                 </div>
                             {% endif %}
                         </div>
@@ -113,7 +113,7 @@
                 {% endfor %}
             </ul>
             {% if form.vars.allow_add %}
-                <a href="#" class="btn btn-primary btn-small" data-addfield="collection" data-collection="{{ form.vars.id }}" data-prototype-name="{{ prototype_name }}">{{ form.vars.add_button_text|trans({}, translation_domain)|parse_icons|raw }}</a>
+                <a href="#" class="btn btn-primary btn-sm" data-addfield="collection" data-collection="{{ form.vars.id }}" data-prototype-name="{{ prototype_name }}">{{ form.vars.add_button_text|trans({}, translation_domain)|parse_icons|raw }}</a>
             {% endif %}
         </div>
     {% endspaceless %}