Ah, ok. I see.
The content box title font size is controlled <h2>, I can work with that.
For me the height mismatch appears to happen for all types of content box other than icon-boxed. So I’ll guess I’ll just use icon-boxed.
There’s an overlapping/padding issue with this solution. The icon circles on the lower row of content boxes cover part of the content box above it.
I think I can work around this by making a set of content_boxes for each row rather than doing them all as one giant set.
You can consider this issue resolved. Thanks.