Bootstrap模态的宽度和边距

<!DOCTYPE html>
<html>
   <head>
      <title>Bootstrap Example</title>
      <link rel = stylesheet href = https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css>
      <script src = https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js></script>
      <script src = https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js></script>
   </head>
   <body>
      <div class=container>
         <h2>Web browser</h2>
         <button type = button class = btn btn-lg data-toggle = modal data-target = #new>More</button>
         <div class = modal fade id=new role = dialog>
            <div class = modal-dialog>
               <div class = modal-content>
                  <div class = modal-header>
                     <button type = button class = close data-dismiss = modal>&times;</button>
                     <h4 class = modal-title>Warning</h4>
                  </div>
                  <div class = modal-body>
                     <p>If JavaScript isn't enabled in your web browser, then you may not be able to see this information correcty.</p>
                  </div>
                  <div class = modal-footer>
                     <button type = button class = btn btn-default data-dismiss = modal>Close</button>
                  </div>
               </div>
            </div>
         </div>
      </div>
   </body>
</html>

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