layer_list_all_out_style.xml

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

    <!-- Define the background properties like color etc -->
    <item android:id="@android:id/background">
        <shape>
            <gradient
                android:startColor="@color/skyblue"
                android:centerColor="@color/colorPrimary"
                android:endColor="@color/orange"
                android:angle="270" />
            <corners android:radius="20dp"/>
        </shape>
    </item>

    <!-- Define the progress properties like start color, end color etc -->
    <item
        android:left="5dp" android:right="5dp" android:top="5dp" android:bottom="5dp">
            <shape>
                <gradient
                    android:startColor="@color/skyblue"
                    android:centerColor="@color/colorPrimary"
                    android:centerY="1.0"
                    android:endColor="@color/orange"
                    android:angle="270" />
                <solid android:color="@color/black"/>
            </shape>
    </item>

</layer-list>