test

www/index.html

@@ -109,13 +109,14 @@
         <div class="modal-dialog modal-xl modal-dialog-centered" role="document">
           <div class="modal-content">
             <div class="modal-header">
-              <h5 class="modal-title">Document</h5>
+              <div class="row modal-title">Document</div>
+              <div class="row">
               <div class="btn-group" role="group" aria-label="Basic example">
                   <button type="button" class="btn btn-secondary">Left</button>
                   <button type="button" class="btn btn-secondary">Middle</button>
                   <button type="button" class="btn btn-secondary">Right</button>
                 </div>
-                
+              </div>
               <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                 <span aria-hidden="true">&times;</span>
               </button>