diff --git a/index.html b/index.html
index 895c478..ec81212 100644
--- a/index.html
+++ b/index.html
@@ -25,10 +25,10 @@
 <div class="container-fluid container-md">
 
   <div class="row">
-    <div class="col-sm-7">
+    <div class="col-xl-7">
       <video id="video" class="video_sized" autoplay></video>
     </div>
-    <div class="col-sm-5">
+    <div class="col-xl-5">
       <h1 class="text-primary">Convert your photos to laser images!</h1>
       <p class="lead">Create something fresh by allowing the browser to use your camera.</p>
       <p class="lead">Or pick an image from your phone and upload it. </p>
@@ -48,12 +48,12 @@
     </div>
   </div>
   <div class="row result" id="result" style="display:none">
-    <div class="col-sm-7">
+    <div class="col-xl-7">
     	<div class="video_sized">
     		<canvas id="canvas" class="video_sized"></canvas>
       </div>
     </div>
-    <div class="col-sm">
+    <div class="col-xl">
       <h2 class="text-primary">Not satisfied with contrast? </h2>
       <p class="lead">Before sending your snap, feel free to modify the contrast by using the slider to reach the effect you desire.</p>
       <div id="slider"></div>
@@ -75,14 +75,14 @@
     </div>
   </div>
   <div class="row result" style="display:none">
-    <div class="col-sm-7">
+    <div class="col-xl-7">
       <h1 class="text-primary"> Got text?</h1>
       <p >If some text is visible on the image, type it before pushing the Send button.</p>
       <div class="form-group">
         <input id="text" type="text" class="form-control form-control-lg" placeholder="Type text here"/>
       </div>
     </div>
-    <div class="col-sm-5">
+    <div class="col-xl-5">
       <h1 class="text-success">Ready to send? </h1>
       <div class="form-group">
         <button id="send" class="form-control form-control-lg btn btn-lg btn-success btn-block">Send</button>
@@ -90,16 +90,16 @@
     </div>
   </div>
   <div class="row result" style="display:none">
-    <div class="col-sm">
+    <div class="col-xl">
       <div id="messages">
       </div>
     </div>
   </div>
   <div class="row" id="preview">
-    <div class="col-sm-7">
+    <div class="col-xl-7">
       <canvas id="simuCanvas" class="video_sized"></canvas>
     </div>
-    <div class="col-sm-5" >
+    <div class="col-xl-5" >
       <h2 class="text-secondary">Preview your creations</h2>
       <p class="lead">Now that your creation have been sent, you can check what they will look like on lasers using these links, sorted by oldest snaps last.</p>