fullWidth prop not working

[hugocostadev]

Describe the bug
The fullWidth prop does not work properly, follow the example below.
There is a "dib" class in a span element that I can't customize because the is not a class handle and the :first-child is not working either.

I tried to do this and its not woked:

.slideChildrenContainer--carousel :first-child { 
  width: 100%;
}

Screenshots

[hugocostadev]

Ok, I miss one detail... :first-child with or without space before are different things.

I was doing :first-child without space, by doing as the example says I could remove the spacing.

I'll maintain the issue because I consider that the prop fullWidth is not working properly.