RecyclerView Scrollbar Custum Thumb 만들기

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:width="24dp" > // 스크롤바 영역 너비
        <shape xmlns:android="http://schemas.android.com/apk/res/android">
            <solid android:color="@android:color/transparent"/>
            <size  />
        </shape>
    </item>
    <item android:width="4dp"
        android:top="10dp" // 스크롤바 상단 여백
        android:bottom="10dp" // 스크롤바 하단 여백
        android:gravity="center">
        <shape xmlns:android="http://schemas.android.com/apk/res/android">
            <solid android:color="@color/col_list_scrollbar_color"/> // 스크롤바 색상
            <corners android:radius="2dp" /> // 스크롤바 thumb 둥글게
        </shape>
    </item>
</layer-list>

        <androidx.recyclerview.widget.RecyclerView
			...
            android:scrollbars="vertical"
            android:scrollbarThumbVertical="@drawable/custom_scrollbar_thumb"
			.... 
            />​