hcp-pad/game/src/main/res/drawable/bg_start_game.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:ignore="ResourceName">

    <item>
        <shape android:shape="rectangle">
            <corners android:radius="@dimen/divider_44px" />
            <gradient
                android:angle="180"
                android:endColor="@color/color_FF8756FF"
                android:startColor="@color/color_FF77B0FF"
                android:type="linear"
                android:useLevel="true" />
        </shape>
    </item>

</layer-list>