SafeKeyboard/app/src/main/res/drawable/keyboard_word_shift_layerlist.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape>
            <solid android:color="#1c69ac" />
            <corners android:radius="5dp"/>
        </shape>
    </item>
    <item
        android:left="16dp"
        android:right="16dp"
        android:top="13dp"
        android:bottom="13dp"
        android:drawable="@drawable/icon_keyboard_capital_default"
        />
</layer-list>