diff --git a/swarmlab/index-doc.html b/swarmlab/index-doc.html
index d1e474b..a734ac1 100644
--- a/swarmlab/index-doc.html
+++ b/swarmlab/index-doc.html
@@ -269,7 +269,7 @@ Swarmlab is a powerful collaboration tool that connects tutors and students in a
 			<!-- useful -->
                         <div class="card card-shadow text-center">
                             <div class="card-body">
-                                <h4 class="card-title"><b>It would be useful!</b></h4>
+                                <h3 class="card-title p-3 mb-2 bg-info text-white"><b>It would be useful!</b></h3>
                                 <p class="card-text"></p>
                                 <div class="dropdown-divider"></div>