Sticky columns
Briefly

The discussion centers on a potential issue with CSS border-spacing not functioning as expected in a live preview compared to local environments. The participants are considering whether this inconsistency could be attributed to the Windows operating system and are suggesting alternative online versions to replicate the problem. One participant suggests inspecting the borders' settings with devtools to identify the exact cause of the issue, emphasizing that such bugs are manageable but require observation for resolution.
I can't seem to reproduce it on my laptop at all. Maybe its a windows problem but I won't be back to my desktop computer until Monday.
Usually these bugs are easy to squash but unless I see it happening to me I'm just guessing.
In your screenshot it looks to me as though the border-spacing:0 isn't being honoured hence the gap.
Maybe you could put up an online version outside of codepen that shows the problem so that we can discount a codepen discrepancy.
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