Fix misplacement of signin overlay and critical update message banner

ui/login/md_screen_container.css

 /* Copyright 2014 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.
  */
 
 #outer-container {
   -webkit-box-align: center;
   -webkit-box-pack: center;
   bottom: 57px;  /* Leave space for the header bar */
   display: -webkit-box;
@@ skipping 63 matching lines @@
 }
 
 #oobe[md-mode] #progress-dots {
   display: none;
 }
 
 /* Screens that have a border and background. */
 #oobe.auto-enrollment-check #inner-container,
 #oobe.autolaunch #inner-container,
 #oobe.confirm-password #inner-container,
-#oobe:not([md-mode]).connect #inner-container,
 #oobe.debugging #inner-container,
 #oobe.enrollment #inner-container,
-#oobe:not([md-mode]).eula #inner-container,
 #oobe.fatal-error #inner-container,
 #oobe.gaia-signin #inner-container,
 #oobe.hid-detection #inner-container,
 #oobe.kiosk-enable #inner-container,
 #oobe.oauth-enrollment #inner-container,
 #oobe.password-changed #inner-container,
 #oobe.ad-password-change #inner-container,
-#oobe.reset #inner-container,
 #oobe.supervised-user-creation #inner-container,
 #oobe.supervised-user-creation-dialog #inner-container,
 #oobe.terms-of-service #inner-container,
 #oobe.arc-tos #inner-container,
 #oobe.update #inner-container,
 #oobe.user-image #inner-container,
 #oobe.wrong-hwid #inner-container,
 #oobe.unrecoverable-cryptohome-error #inner-container {
   background: white;
   box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.3),
@@ skipping 11 matching lines @@
 
 /* Only play this animation when 'down' class is removed. */
 .oobe-display #inner-container:not(.down) {
   transition: transform 200ms ease-in-out;
 }
 
 .oobe-display #inner-container.down {
   transform: translateY(50px) rotateX(-2.5deg);
 }
 
-#oobe:not([md-mode]) #step-logo {
-  -webkit-margin-start: 17px;
-  display: -webkit-box;
-  position: absolute;
-  top: 15px;
-}
-
 #oobe[md-mode] #step-logo {
   display: none;
 }
 
 #progress-dots {
   -webkit-box-pack: center;
   display: -webkit-box;
   margin-top: 15px;
   transition: opacity 200ms ease-in-out, visibility 200ms ease-in-out;
 }
@@ skipping 101 matching lines @@
   line-height: 31px;
   text-transform: lowercase;
   width: 23em;
 }
 
 .header-section::before {
   /* Divider in header between product name and title,
    * like "[Product name] > [step header]". */
   content: '\00A0\203A\00A0\00A0';
 }