Fix invalid proptype

cyphereza · cyphereza · commit 26b0e7f35193 · 2018-04-09T09:52:01.000+08:00
diff --git a/src/Drawer.js b/src/Drawer.js
@@ -42,7 +42,9 @@ export default class Drawer extends Component {
     isOpen: false,
     header: "Messages",
     headerHeight: 70,
-    teaserHeight: 75
+    teaserHeight: 75,
+    contentStyle: null,
+    backdropStyle: null,
   };
 
   // Define state
