android webview size fix

README.md

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+Chinese grammar data manually copied and edited from <https://resources.allsetlearning.com/chinese/grammar/Main_Page>
+
+## How it works for Android
+
+Using Tauri, it runs on Android even with dev server down, with `tauri android run`. (while no hot-reloading)
+
+An extra CSS is needed for Android webview fix:-
+
+```css
+body {
+  padding-top: env(safe-area-inset-top);
+  padding-bottom: env(safe-area-inset-bottom);
+  padding-left: env(safe-area-inset-left);
+  padding-right: env(safe-area-inset-right);
+}
+```