diff --git a/core/modules/simpletest/templates/simpletest-result-summary.html.twig b/core/modules/simpletest/templates/simpletest-result-summary.html.twig
index 2f87ed0..1d3bfd1 100644
--- a/core/modules/simpletest/templates/simpletest-result-summary.html.twig
+++ b/core/modules/simpletest/templates/simpletest-result-summary.html.twig
@@ -17,6 +17,6 @@
  * @ingroup themeable
  */
 #}
-<div class="simpletest-{{ fail + exception == 0 ? 'pass' : 'fail' }}">
+<div>
   {{ label }} {{ items|join(', ') }}
 </div>
diff --git a/core/modules/simpletest/templates/simpletest-result-summary.html.twig b/core/themes/classy/templates/simpletest-result-summary.html.twig
similarity index 100%
copy from core/modules/simpletest/templates/simpletest-result-summary.html.twig
copy to core/themes/classy/templates/simpletest-result-summary.html.twig