styles.xml

<resources>
    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

    <style name="MyCardView" parent="Widget.MaterialComponents.CardView">
        <item name="cardCornerRadius">@dimen/corner_radius</item>
        <item name="cardElevation">4dp</item>
        <item name="cardUseCompatPadding">true</item>
    </style>
</resources>