Cf. observablehq.com/@bryangingechen/grid-inputs

Nice! I will look at this for a future version.

any clue why the last col is about halve the width of others if the number of cols is greater than 1? I do not get it.

Yes, it's the Observable CSS coming in to the table TD element. You could see this when looking at the "computed" styles. I fixed it by setting margin to 0 for my tables.

I see, you added the padding = 0, thanks for the help and a good day, Cord

Yes, that overrides the Observable style which was causing the issue.