Get rid of center-parent

examples/preact/index.html

@@ -8,7 +8,7 @@
       crossorigin="anonymous"
     />
     <style>
-      .center-parent {
+      body {
         display: flex;
         height: 100vh;
       }

examples/preact/index.js

@@ -130,9 +130,6 @@ class App extends Component {
     switch (state.type) {
       case 'CameraPicker':
         return h(
-          'div',
-          { class: 'center-parent' },
-          h(
             'div',
             {
               class: 'center'
@@ -159,14 +156,9 @@ class App extends Component {
               ),
               '!'
           )
-          )
         );
       case 'Status':
-        return h(
-          'div',
-          { class: 'center-parent' },
-          h('div', { class: 'center' }, state.message)
-        );
+        return h('div', { class: 'center' }, state.message);
       case 'Config':
         return h(
           'div',