When web components are modular like Lego bricks down to the elements level, they become more versatile and easier to maintain. We believe it’s the next step to take in modular web design.
It’s a clever system: put a half-gutter around all elements and a half-gutter around the containers. That way no matter what touches what, full gutters are naturally there.
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Learning from Lego: A Step Forward in Modular Web Design is a post from CSS-Tricks