Angular8 :How to add box shadow in mat-form field outline

I’m using angular materail and I want to have a box shadow in my inputs .
I don’t Know How to add box shadow in mat-form field outline.
I wrote this code but it doesn’t work correctly;

   ::ng-deep
.mat-form-field-appearance-outline.mat-focused
.mat-form-field-outline-thick {
color: red;
box-shadow: 0 4px 4px red !important;
}

}