Hi Heather,
WP addsrow-gap
to its columns, and each <p>
element has a default margin bottom.
Those 2 combined are the gap you see.
I would recommend using the Grid
block of GenerateBlocks plugin instead of WP’s columns block, so you can set vertical gap to 0 on mobile.
And the Headline
block of GB allows you to set spacing (padding/margin) to the headline (can be used as paragraph as well), so you can set the bottom margin of the paragraph to 0.