Fix span

Author: a7ul

3-react-native-internals/3.1-react-native-internals.md

@@ -107,10 +107,12 @@ View Managers are basically classes extended from `ViewManager` class in Android
 When the app is run in `DEV` mode, the Javascript thread is spawned on the development machine. Even though the JS code is running on a more powerful machine as compared to a phone, you will soon notice that the performance is considerably lower as compared to when running in bundled mode or production mode. This is unavoidable because a lot more work is done in DEV mode at runtime to provide good warnings and error messages, such as validating propTypes and various other assertions. Furthermore, the latency of communication between the device and the JS thread also comes into play.
 
 Link: <https://www.youtube.com/watch?v=8N4f4h6SThc> - RN android architecture
-<span style="display: flex;align-items: center;justify-content: center; padding: 20px 0;">
+
+<div style="display: flex;align-items: center;justify-content: center; padding: 20px 0;">
 
   <iframe width="560" height="315" src="https://www.youtube.com/embed/8N4f4h6SThc" frameborder="0" allowfullscreen></iframe>
-</span>
+
+</div>
 
 ### React Native's new Architecture (Fabric)