change checkbox color in angular material

Question

I'm using angular material(6.4.7). I was using select and I want to change the color of select checkbox. I have tried /deep/ and ::ng-deep but no success. I think, I am using it in wrong way for these checkbox.

Here is the stackblitz link

Answer 1

adding this to the select-multiple-example.css works in the stack-blitz link

::ng-deep .mat-primary .mat-pseudo-checkbox-checked {
    background: red;
}