nicer

www/index.html

         <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="col align-self-center autodoc_valign">
-                <div class="btn-group" role="group" aria-label="Basic example">
-                  <button type="button" class="btn btn-secondary">S</button>
-                  <button type="button" class="btn btn-secondary">M</button>
-                  <button type="button" class="btn btn-secondary">L</button>
+              <div class="row">
+                <div class="col align-self-begin">
+                  <h5 class="modal-title">Document</h5>
+                </div>
+                <div class="col align-self-center">
+                  <div class="btn-group" role="group" aria-label="Basic example">
+                    <button type="button" class="btn btn-secondary">S</button>
+                    <button type="button" class="btn btn-secondary">M</button>
+                    <button type="button" class="btn btn-secondary">L</button>
+                  </div>
+                  <i class="fas fa-2x fa-file-image"></i>
                 </div>
-                <i class="fas fa-2x fa-file-image"></i>
               </div>
             </div>
             <div class="row-1"></div>