diff --git a/rapids/templates/rapids/mark.html b/rapids/templates/rapids/mark.html
index d48c14ac..65e187f0 100644
--- a/rapids/templates/rapids/mark.html
+++ b/rapids/templates/rapids/mark.html
@@ -86,7 +86,7 @@
                 </div>
             {% endif %}
             {% if review %}
-                <button type="button" name="check-review" class="check-review btn btn-default">Check review answers</button><br/>
+                <button type="button" name="check-review" class="check-review">Check review answers</button><br/>
             {% endif %}
             <span class="save-buttons">
                 {% if question_details.current > 1 %}