diff --git a/mod/assign/templates/attempt_history_chooser.mustache b/mod/assign/templates/attempt_history_chooser.mustache
index cbe8f512695..3f236fed512 100644
--- a/mod/assign/templates/attempt_history_chooser.mustache
+++ b/mod/assign/templates/attempt_history_chooser.mustache
@@ -1,6 +1,6 @@
 {{#submissioncount}}
 <div>
-    <a class="btn" href="#" data-region="attempt-chooser" data-submissions="submissions-list-{{uniqid}}">{{#str}}viewadifferentattempt, mod_assign{{/str}}</a>
+    <a class="btn btn-secondary" href="#" data-region="attempt-chooser" data-submissions="submissions-list-{{uniqid}}">{{#str}}viewadifferentattempt, mod_assign{{/str}}</a>
     <div class="hide" id="submissions-list-{{uniqid}}">
         <div data-region="submissions-list">
         {{#submissions}}