path: root/res/drawable/bg.xml

<?xml version="1.0" encoding="utf-8"?>
<shape 
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="rectangle">
  <gradient 
    android:startColor="#acacac" 
    android:centerColor="#4f4f4f"
    android:endColor="#3f3f3f" 
    android:angle="-90">
  </gradient>
</shape>