Metro/app/src/main/res/drawable/toggle_outline_buttons.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true">
        <shape android:shape="rectangle">
            <corners android:radius="25dip" />
            <stroke android:width="2dip" android:color="?android:attr/textColorPrimary" />
            <solid android:color="@android:color/transparent" />
        </shape>
    </item>

    <item android:state_checked="true">
        <shape android:shape="rectangle">
            <corners android:radius="25dip" />
            <stroke android:width="2dip" android:color="?android:attr/textColorPrimary" />
            <solid android:color="@android:color/transparent" />
        </shape>
    </item>

    <item>
        <shape android:shape="rectangle">
            <solid android:color="@android:color/transparent" />
        </shape>
    </item>
</selector>