Baseliner

Baseliner adds horizontal & vertical lines to help you align your grid to any website.
Adds a horizontal and/or vertical lines on top of any website.

The Baseliner extension adds a fully customisable CSS layer on top of any website to help you align your design and ensure the grid is in place.
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The best place for support is not in the reviews section below, but on the Baseliner GitHub repo:

https://github.com/jpedroribeiro/Baseliner/issues

Check out full set of features and how to contribute on our GitHub page:

https://github.com/jpedroribeiro/Baseliner