import { Component, OnInit } from '@angular/core';
import {ToastrService} from "ngx-toastr";
//import {ViewEncapsulation} from "@angular/cli/lib/config/schema";


@Component({
  selector: 'app-toastr',
  templateUrl: './toastr.component.html',
  styleUrls: ['./toastr.component.css'],
  //encapsulation: ViewEncapsulation.None
})

<div>
  <div class="myspan">
    something
  </div>
</div>

div div{
background-color: aqua;
}

.myspan {
  background-color: darkgreen;
}