diff --git a/htdocs/themes/math4/system.html.ep b/htdocs/themes/math4/system.html.ep
index baf829f845..2717e6c08c 100644
--- a/htdocs/themes/math4/system.html.ep
+++ b/htdocs/themes/math4/system.html.ep
@@ -165,7 +165,7 @@
 		% if ($c->can('message')) {
 			<div id="message_bottom" class="message"><%= $c->message %></div>
 			<div>
-				<button type="button" id="dismiss-messages-btn" class="btn btn-primary d-none">
+				<button type="button" id="dismiss-messages-btn" class="btn btn-secondary d-none">
 					<%= maketext('Dismiss All Messages') %>
 				</button>
 			</div>