Modify ion-toolbar

Hey everyone,

I want to modify Ionic toolbar but something is happening when I try it. I’ve seen different style options in the documentation, but what I want to do is to add a border-radius, which is giving me the following result.

So I don’t know what can be the reason to see black behind when there’s not any styles making that both in ion-header or ion-toolbar. I would be appreciated if someone could help.

Thank you for your time.