diff --git a/agaric/templates/elements/fieldset.html.twig b/agaric/templates/elements/fieldset.html.twig
index e46d0b1..5dbce40 100644
--- a/agaric/templates/elements/fieldset.html.twig
+++ b/agaric/templates/elements/fieldset.html.twig
@@ -25,7 +25,6 @@
 #}
 {%
   set classes = [
-    'panel',
     'js-form-item',
     'form-item',
     'js-form-wrapper',
@@ -36,7 +35,6 @@
   {%
     set legend_span_classes = [
       'form-label',
-      'panel-heading',
       'fieldset-legend',
       required ? 'js-form-required',
       required ? 'form-required',
@@ -44,7 +42,7 @@
   %}
    <p{{ legend_span.attributes.addClass(legend_span_classes) }}>{{ legend.title }}</p>
 
-  <div class="panel-block fieldset-wrapper">
+  <div class="fieldset-wrapper">
     {% if errors %}
       <div>
         {{ errors }}