Pacific: Add vertical lines between columns?

I am using the Pacific template and would like to add a Vertical line between columns to better separate the sections.

How can I do that?

Thanks

I am trying to do the same thing. I checked with the Squarespace Support and they told me to create a line as an image (using an image editor). They said to create the line at 1 pixel, color code would be #BBBBBB; however my screen shows it as #E0E0E0. They also told me to not include any padding in the image. I haven’t tried it yet so I’m not sure if it’ll work.