update readme

Author: aecsocket

README.md

@@ -191,7 +191,9 @@ Currently, this app uses Relm4 on top of GTK/Adwaita, but we might switch this t
 
 ### ⚙️ `wordbase-android`
 
-![Screenshot of the Wordbase app, displaying lookup results and the dictionary management page](./static/wordbase-android.png)
+<p align="center">
+  <img src="./static/wordbase-android.png" height="480px" alt="Screenshot of the Wordbase app, displaying lookup results and the dictionary management page" />
+</p>
 
 Android app which bundles the Wordbase engine: this allows users to manage dictionaries, perform lookups, and exposes intents for other apps to display lookups to users.