Vertical lines grid

[matanbe (Mat)]

hey, i’m looking to create something like this background grid.
http://kekselias.com/

I know i saw something here in the past, that had a similar design, but i can’t find it.

Any help or advise about what it the best way to create it would be appreciated.
Thanks

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[garymichael1313 (G.J.)]

Hi,

It’s 9 divs with left and right border colors as a the background.