better images

www/index.html

       <div class="autodoc_document_template d-none">
         <div class="autodoc_document_template_carousel">
           <div class="text-center">
-            <img /><br/>
+            <img class="img-thumbnail rounded" /><br/>
             <span class="lead"></span>
           </div>
         </div>
         </div>
       </div>
     </div>
+
     <!-- Upload -->
     <div class="container d-none" id="autodoc_tab_upload">
       <div class="d-none autodoc_template_progress">