PLT-2549 - Improvements to theme stuff (#2657)

webapp/components/tutorial/tutorial_intro_screens.jsx

@@ -1,6 +1,7 @@
 // Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
 // See License.txt for license information.
 
+import $ from 'jquery';
 import UserStore from 'stores/user_store.jsx';
 import TeamStore from 'stores/team_store.jsx';
 import PreferenceStore from 'stores/preference_store.jsx';
@@ -34,6 +35,12 @@ export default class TutorialIntroScreens extends React.Component {
 
         this.state = {currentScreen: 0};
     }
+    componentDidMount() {
+        $('body').addClass('app__body');
+    }
+    componentWillUnmount() {
+        $('body').removeClass('app__body');
+    }
     handleNext() {
         if (this.state.currentScreen < 2) {
             this.setState({currentScreen: this.state.currentScreen + 1});