tachiyomi/app/src/main/res/drawable/ic_arrow_down_white_32dp.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="32dp"
    android:height="32dp"
    android:viewportWidth="32"
    android:viewportHeight="32">
    <group
        android:pivotX="32"
        android:pivotY="32"
        android:scaleX="0.8"
        android:scaleY="0.8">
        <path
            android:fillColor="@android:color/white"
            android:pathData="M20,12l-1.41,-1.41L13,16.17V4h-2v12.17l-5.58,-5.59L4,12l8,8 8,-8z" />
    </group>
</vector>