@use '~@angular/material' as mat;
@import "../../../node_modules/@angular/material/theming";

$app-primary: mat.define-palette(mat.$grey-palette);
$app-accent:  mat.define-palette(mat.$light-blue-palette);
$app-warn:    mat.define-palette(mat.$red-palette);

$primary: mat.get-color-from-palette($app-primary);
$accent: mat.get-color-from-palette($app-accent);
$warn: mat.get-color-from-palette($app-warn);

@mixin doubtfire-card {
    border-radius: 10px;
}

.mat-card.danger-card {

  @include doubtfire-card();
}

@use '../../../node_modules/@angular/material' as mat;
@import '../../../node_modules/@angular/material/theming';

$app-primary: mat.define-palette(mat.$grey-palette);
$app-accent: mat.define-palette(mat.$light-blue-palette);
$app-warn: mat.define-palette(mat.$red-palette);

$primary: mat.get-color-from-palette($app-primary);
$accent: mat.get-color-from-palette($app-accent);
$warn: mat.get-color-from-palette($app-warn);

@mixin doubtfire-card {
  border-radius: 10px;
}

.mat-card.danger-card {
  @include doubtfire-card();
}

Remove ~ reference in sass use statement
FIX: Remove ~ reference in sass use statement
