app/src/main/res/drawable/side_nav_bar.xml

   1 <shape xmlns:android="http://schemas.android.com/apk/res/android"
   2     android:shape="rectangle">
   3     <gradient
   4         android:angle="135"
   5         android:centerColor="@color/colorPrimary"
   6         android:endColor="@color/colorPrimaryDark"
   7         android:startColor="#b64db6"
   8         android:type="linear" />
   9 </shape>