I just couldn't help myself

skins/base/css/organisms/UserSettings.css

@@ -0,0 +1,20 @@
+/*
+Copyright 2015 OpenMarket Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+.mx_UserSettings {
+    max-width: 720px;
+    margin: auto;
+}

skins/base/views/organisms/UserSettings.js

@@ -53,7 +53,7 @@ module.exports = React.createClass({
                 return <Loader />
             case this.Phases.Display:
                 return (
-                    <div className="mx_UserSettings" style={{maxWidth: "720px", margin: "auto"}}>
+                    <div className="mx_UserSettings">
                         <div className="mx_UserSettings_User">
                             <h1>User Settings</h1>
                             <hr/>