[Preview] Allow props to override defaults

[mbrookes]

Closes #4

[jquense]

We should move just the aria label prop above the spread so the other props can't be overridden accidently

[mbrookes]

I've updated it so that the two hardcoded props can be overridden. In terms of code style, any preference as to whether the other props should live in the object or directly in the div?

[jquense]

In general I'd prefer the props to be online in the div but I don't care that much if it's a pain to change

[jquense]

thanks!