diff --git a/index.html b/index.html
index e3726e7a06..b916883d40 100644
--- a/index.html
+++ b/index.html
@@ -59,19 +59,19 @@ base_url: "./"
 
     <div class="row">
       <div class="col-sm-3">
-        <img src="http://expo.getbootstrap.com/screenshots/coinbase.jpg" alt="" class="thumbnail">
+        <img src="http://expo.getbootstrap.com/screenshots/coinbase.jpg" alt="" class="img-responsive img-thumbnail">
         <h4>Coinbase</h4>
       </div>
       <div class="col-sm-3">
-        <img src="http://expo.getbootstrap.com/screenshots/localcrime.jpg" alt="" class="thumbnail">
+        <img src="http://expo.getbootstrap.com/screenshots/localcrime.jpg" alt="" class="img-responsive img-thumbnail">
         <h4>Localcrime</h4>
       </div>
       <div class="col-sm-3">
-        <img src="http://expo.getbootstrap.com/screenshots/fortrabbit.jpg" alt="" class="thumbnail">
+        <img src="http://expo.getbootstrap.com/screenshots/fortrabbit.jpg" alt="" class="img-responsive img-thumbnail">
         <h4>Fortrabbit</h4>
       </div>
       <div class="col-sm-3">
-        <img src="http://expo.getbootstrap.com/screenshots/sentry.jpg" alt="" class="thumbnail">
+        <img src="http://expo.getbootstrap.com/screenshots/sentry.jpg" alt="" class="img-responsive img-thumbnail">
         <h4>Sentry</h4>
       </div>
     </div>