Mat dialog

.mat-dialog-container

// Overlay-based components have a panelClass property (or similar) 
// that can be used to target the overlay pane.

this.dialog.open(DialogExampleComponent, { 
	panelClass: 'dialog-container-custom' 
});

// then style it from there

.dialog-container-custom .mat-dialog-container {
	padding: 0;
	background: grey;
}

Mat dialog

@Component({/* ... */})
export class YourDialog {
  constructor(public dialogRef: MatDialogRef<YourDialog>) { }

  closeDialog() {
    this.dialogRef.close('Pizza!');
  }
}

Source: material.angular.io

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