How to change color or customize header arrow for expandableRow in Mui Datatable

I have a MUI data table with the expandable rows Option. I have also enabled the ExpandAll button on the header row which displays an arrow in the title row which is similar to the arrows in all the rows. This gets confusing for the user. SO i want to change the header arrow to a different color by overriding its properties or adding some text below it. However I am not able to find any documentation to change its properties. What do i do?

   options={{
                download: false,
                expandableRows: true,
                expandableRowsOnClick: true,

                renderExpandableRow: (rowData, rowMeta) => {}
}}

The arrow that I want to change is highlighted in the image.

Image