LeOS-Keyboard/java/res/drawable/keyboard_background_lxx_dark.xml

<?xml version="1.0" encoding="utf-8"?>

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@color/keyboard_separator_lxx_dark" />
        </shape>
    </item>
    <item android:top="1dp">
        <shape android:shape="rectangle">
            <solid android:color="@color/key_background_lxx_dark" />
        </shape>
    </item>
</layer-list>