Angular 5 and material - How to change the background color from SnackBar component

I have to change the background from the snackbar component. I'm using it to alert or inform the user about some either error or completed action the user did.

The material version from the project. "@angular/material": "^5.0.0-rc.1",

The documentation https://material.angular.io/components/snack-bar/api say about an api to change the class.

panelClass: string | string[] Extra CSS classes to be added to the snack bar container.

This is what I add in the css file.

.mycsssnackbartest {
  background-color: blue;
}

This is the code to open the snackbar

this.snackBar.open('Informing the user about sth', 'User Message' , {
    panelClass: ['mycsssnackbartest ']
} );

What am I doing wrong?

You have to use the panelClass option (since v6) to apply classes on a snackbar like this:

this.snackBar.open(message, action, {
  duration: 2000,
  panelClass: ['blue-snackbar']
});

CSS (in global styles.scss):

.blue-snackbar {
  background: #2196F3;
}

See the Stackblitz example

Using themes:

Primary:

this.snackBar.open('Some message','Some action', {
    duration: 2000,
    panelClass: ['mat-toolbar', 'mat-primary']
});

Switch: 'mat-primary' to 'mat-accent' or 'mat-warn'

//in component.ts
this.snackbar.open(message, '', {
    duration: 2000,
    verticalPosition: 'top',
    panelClass: ['warning']
 });
//in component.css
::ng-deep .warning{
   background: 'yellow';
}

Yeah after adding ::ng-deep in global style file(.css) works fine after each attribute... As follows

noMatchConfig: MatSnackBarConfig = {
    duration: 2000,
    horizontalPosition: 'right',
    verticalPosition: 'top',
    panelClass:['redNoMatch']
  }



::ng-deep .redNoMatch
{
  color:white;
  background: #F44336 !important;
}

This can also be achieved globally by importing MAT_SNACK_BAR_DEFAULT_OPTIONS in app.module.ts:

app.module.ts

import {
  MatSnackBarModule,
  MAT_SNACK_BAR_DEFAULT_OPTIONS,
} from '@angular/material/snack-bar';

@NgModule({
  providers: [
    {
      provide: MAT_SNACK_BAR_DEFAULT_OPTIONS,
      useValue: { panelClass: ['mycsssnackbartest'] },
    },
  ],
})

styles.css

.mycsssnackbartest {
  background-color: blue;
}