res/drawable/overflow.xml

<?xml version="1.0" encoding="utf-8"?>
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<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24"
    android:viewportHeight="24">

    <path
        android:pathData="M0,0h24v24H0V0z" />
    <path
        android:fillColor="#FFFFFF"
        android:pathData="M12,8c1.1,0,2-0.9,2-2s-0.9-2-2-2c-1.1,0-2,0.9-2,2S10.9,8,12,8z
M12,10c-1.1,0-2,0.9-2,2c0,1.1,0.9,2,2,2 c1.1,0,2-0.9,2-2C14,10.9,13.1,10,12,10z
M12,16c-1.1,0-2,0.9-2,2s0.9,2,2,2c1.1,0,2-0.9,2-2S13.1,16,12,16z" />
</vector>