Thanks for this article, it is very interesting.
Just one comment: I find it a pity that its title is misleading. As it is now, it sounds as though one could make one's whole website responsive with just one line of CSS. That isn't what this article aims at explaining: it explains how to make a grid responsive with just one line of CSS. This is already really interesting, so no need to oversell.
Even just changing HTML -> Grid makes a huge difference in the title. "How to make your Grid responsive by adding a single line of CSS" would be so much better.
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