snack bar: change background color

[constantinlucian]

I use snack-bar to show notifications. I want to change background color when the response is: error (background: red) or success(background : green).

Code:
let config = new MdSnackBarConfig();
config.duration = 500;
snackBarRef = this.snackBar.open("Message", "", config);

snackBarRef.afterOpened().subscribe(()=>{ });
snackBarRef.afterDismissed().subscribe(()=>{ });

I tried to use:
let snackContainer = document.getElementById("cdk-overlay-0");
snackContainer.firstElementChild.setAttribute("style","background-color:red");
but the snack-bar disappear.

[Kyderman]

+1, I tried lots of css selectors and couldnt get any luck which sucked a bit.

[crisbeto]

This was added with #2804 which will be in the next release.

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