Multiple child for media query

[Njiallu]

The MediaQuery component only supports one child.

The error generated when using multiple child is somewhat obscure as well.
It's explicitly told in the docs but that would very handy.

It could, for example, apply the styles on every child.
I don't know if there is a technical limitation preventing this
but at least a more explicit error would be awesome.

here is a reproduction of said problem:
https://codesandbox.io/s/stoic-agnesi-d6ui9p?file=/src/App.tsx