How do you adjust repeater column data so that it displays with desired spacing in UI?

I’m new to repeaters and have not been able to find any info on this seemingly basic function. I’m using a repeater to display data in a table. I have a line of static column headers at the top of a page and a repeater widget under them for the data to be displayed. I have the column headers spaced at different distances, so the data that will display in the repeater below them looks good visually. However, I cannot figure out how to adjust anything in the repeater to make the column data in it appear in the correct locations under their corresponding static headers. This seems like something extremely basic, so what am I missing?