Infra 2204 - Add class to newsletter image for smaller screens

Signed-off-by: Eric Poirier <eric@eclipse.org>
diff --git a/content/thankyou/newsletter.tpl.php b/content/thankyou/newsletter.tpl.php
index d005583..d323b5a 100644
--- a/content/thankyou/newsletter.tpl.php
+++ b/content/thankyou/newsletter.tpl.php
@@ -47,7 +47,7 @@
             </div>
           </div>
         </div>
-        <div id="newsletter-image" class="col-lg-5">
+        <div id="newsletter-image" class="col-lg-5 col-md-6">
           <img src="/downloads/images/newsletter-image.png"/>
         </div>
       </div>