Ovewrite responsive rule from a Component

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Hey folks,

at first @adamwathan and contributors: Many thanks for this awesome framework. It helped me, as a backend developer to love to build frontends agains... thanks!

One question.

I've a extracted component for example ButtonGroup which have defined to be md:w-full but in one case I want to overwrite this rule for this component. But it looks like that the second md:w-1/2 doesn't apply ... any tricks to solve this?

<Divx class="md:w-full"></div>

And then

<ButtonGroup class="md:w-1/2"></ButtonGroup>

Thanks!