How to replace the arrow by tirangle in mat-paginator?

Question

I created a mat-paginator like that

but I want to modify the icons in the form of a triangle (as shown in the photo) => i want replace the arrow by tirnagle

how do i change the icon to a triangle ?

file.ts :

@ViewChild(MatPaginator, {static: true}) paginator: MatPaginator;
@ViewChild(MatSort, {static: true}) sort: MatSort;

file.html:

<mat-paginator [pageSizeOptions]="[5, 10, 15, 20]"></mat-paginator>