Add style to an Ion-Alert

Solution for Ionic v4
For so many time i was trying to push some cssStyle to the ion-alert and today was the day.
Normally i was trying to do this:

But after hour trying to make it works, i decide to change the exactly the css name of the alert and put the style in variables.scss.
In my case.
For header the class was:
For the non-selected options was:
And For the selected option was: [aria-checked=true].sc-ion-alert-md

Maybe is not the best way to made it, but works really good

I found out the hard way but The best approach would be to use the cssSyle and put the style in the global.scss.