Moving Sections

Site URL: https://bugle-gopher-x7gs.squarespace.com/

Hello,  

      I had my sections of the home page lined up like I wanted them and then finally figured out how to adjust the banner image height to a good size by reducing it height wise. When I did this there created a gap between each section especially from the banner image to the first section which was originally closer together and the entire page looked more coherent before. Is there a way to adjust the sections closer together? Every tutorial I've found seems outdated as it says to use the Up/Down arrows or by using the Format feature and adjusting to Small which no longer exist it seems. Thank you.