Spacing Between Rows with Materialize CSS

Answer 1

I figured it out. Put each col within a single row will eliminate the vertical spacing.

  

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It is confusing but it works. Conceptually, I would think that a "row" is like a table row, forcing everything inside it to be on a single row regardless of size, but this does work since each col has s12 (full width) size. Hope this answer helps someone else.