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CSS sticky not working

I am just trying out CSS sticky to sticky a column on the left whilst the right column continues to scroll.

I have a very basic page here, with the Sticky test div set to sticky, and a height of 20px. From a look on the forum it looked like overflow not being set to visible might be the culprit. But as far as I can tell it all looks good.

if anyone could spot what I’m missing that would be much appreciated. Thank you!

OK, I found the solution. The alignment for the grid was set to stretch, and needed to be changed to align to the top.