Fix Host stuck at the right side

remoting/webapp/main.css

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p,
 blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em,
 font, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, dl,
 dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody,
 tfoot, thead, tr, th, td, button {
@@ skipping 657 matching lines @@
   width: 315px;
 }
 
 #session-client-plugin {
   box-shadow: 0 0 8px 0 black;
   -webkit-user-select: none;
 }
 
 #session-client-plugin {
   display: block;
+  flex-shrink: 0;
 }
 
 .session-client-inactive {
   -webkit-filter: grayscale(70%);
   transition: -webkit-filter 0.218s;
 }
 
 #set-pin-table td {
   border-bottom: 6px solid transparent;
 }
@@ skipping 77 matching lines @@
 /*
  * With MediaSource-based rendering the plugin is transparent and is placed on
  * top of the <video> element so that it can still receive mouse events.
  *
  * TODO(sergeyu): This is temporary solution. Ideally mouse and keyboard events
  * should be captured on JS level and passed to the plugin.
  */
 #video-container.mediasource-rendering #client-plugin-container {
   opacity: 0;
 }