diff --git a/content/en/docs/tutorials/kubernetes-basics/scale/scale-intro.html b/content/en/docs/tutorials/kubernetes-basics/scale/scale-intro.html
index 2c90e68e69..943ef01e0f 100644
--- a/content/en/docs/tutorials/kubernetes-basics/scale/scale-intro.html
+++ b/content/en/docs/tutorials/kubernetes-basics/scale/scale-intro.html
@@ -61,11 +61,11 @@ weight: 10
                         <li data-target="#myCarousel" data-slide-to="1"></li>
                     </ol>
                       <div class="carousel-inner" role="listbox">
-                        <div class="item active">
+                        <div class="item carousel-item active">
                           <img src="/docs/tutorials/kubernetes-basics/public/images/module_05_scaling1.svg">
                         </div>
 
-                        <div class="item">
+                        <div class="item carousel-item">
                           <img src="/docs/tutorials/kubernetes-basics/public/images/module_05_scaling2.svg">
                         </div>
                       </div>