path: root/app/src/main/res/drawable/btn_primary.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Filled accent button with the platform press ripple on top. -->
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="?android:attr/colorControlHighlight">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@color/accent"/>
            <corners android:radius="@dimen/button_radius"/>
        </shape>
    </item>
</ripple>