GRID PILE: Stacking CSS Grids for Impossible Layouts
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Stacking CSS Grids to resolve lack of sub-grid without flattening HTML source. 

A [Pen](https://codepen.io/mor10/pen/rzGqzr) by [Morten Rand-Hendriksen](https://codepen.io/mor10) on [CodePen](https://codepen.io).

[License](https://codepen.io/mor10/pen/rzGqzr/license).