I am new to angular... 
My mat-table is working fine, but when column has filter and sorting functionality the sort arrows is not visible on columns with filter.
I was trying to adjust the column wight, but no matter how small or big the column the arrows is not visible.
There is sample project that reproduce my issue.

<https://stackblitz.com/edit/angular-hbakxo-sdjyya?file=app%2Ftable-filtering-example.ts>