@import '~@angular/material/prebuilt-themes/indigo-pink.css';

encapsulation: ViewEncapsulation.None

@import '~@angular/material/prebuilt-themes/indigo-pink.css';

http://localhost:58963/~@angular/material/prebuilt-themes/indigo-pink.css 404 (Not Found)

resolve: {
            extensions: [".ts", ".js"],
            "alias": {
                "~": path.resolve(__dirname, './node_modules')
            }
        },