How to make a line less than 1 thick?

[mikebos671]

My question was answered here:

Finer line as separator?

The minimum thickness of a line is 1, it’s not possible to do 0.25 or 0.5, even if you use a custom list and add a line component. The best way around it is to create a thin line in image editing software, save it as a .png and import it as an image into a custom list.