CSS code for dropdowns and tables!

I have the following CSS code to change dropdown settings (i.e. the colour of the arrow, text)
But the x sign when you want to clear the dropdown is still there.

/* delete cell */
.dash-delete-cell {
    --accent : black;

/* dropdown text */
.Select-menu-outer {
     --accent : black;

/* dropdown arrow */
.Select-arrow {
    --accent: black;

Does anyone also know the equivalent code for table selecting/deselecting and for dropdown multi select (default is blue)