Remove the autosizing modes in favor of a dev site link.

Source/devtools/front_end/overrides.css

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 24 matching lines @@
 
 .overrides-view .tabbed-pane-header {
     border: none transparent !important;
     width: auto;
     flex: 0 0 auto;
 }
 
 .overrides-view .tabbed-pane-content {
     padding-top: 10px;
     padding-left: 10px;
+    padding-right: 10px;
     overflow-x: hidden;
 }
 
 .overrides-view .tabbed-pane-header-contents {
     margin: 0;
 }
 
 .overrides-view .tabbed-pane-header-tabs {
     display: flex;
     flex-direction: column;
@@ skipping 53 matching lines @@
     color: gray;
 }
 
 .overrides-device-value-label {
     overflow: hidden;
     white-space: nowrap;
     text-overflow: ellipsis;
     padding-top: 3px;
 }
 
+.overrides-viewport {
+    width: 100%;
+}
+
 .overrides-viewport input {
     text-align: right;
 }
 
 .overrides-viewport input[type=range] {
     width: 100%;
 }
 
 button.overrides-swap {
     height: 20px;
 }
 
 .overrides-viewport label {
     display: block;
     margin-bottom: 5px;
 }
 
 .overrides-viewport table {
     margin-bottom: 5px;
 }
 
 .overrides-viewport > label {
     margin-bottom: 8px;
 }
 
+.overrides-viewport .help-footnote {
+    border-top: 1px solid #EEEEEE;
+    margin: 0;
+    padding: 12px;
+}
+
 .overrides-user-agent input[type=text] {
     width: 400px;
     max-width: 90%;
 }
 
 .overrides-user-agent select {
     margin: 7px 0;
 }
 
 .overrides-sensors > label {
@@ skipping 59 matching lines @@
     position: relative;
     top: 2px;
     background-position: -202px -107px;
     float: left;
     margin-right: 4px;
 }
 
 .overrides-view .overrides-footer .warning-icon-small {
     margin-right: 3px;
 }