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I am trying to use dividers, but I'm finding that there is a 1px or thereabouts, sized line between the different grids. Is there any way to get rid of them to look like a constant color?

test file :
https://brownelldesignstudios.com/temp/TEST.wbs

Have you tried using offset on dividers for example 1 or -1

Nope, but it feels more like a workaround than an actual solution. However, it does seem to work at some level (I'd rather have px over %.) But thank you!

From your project is it not clear where to look exactly.
When sharing a project, can you please remove everything that is not relevant to your question to prevent confusion?

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There is a thin white line in the color separations.

https://brownelldesignstudios.com/temp/line.png

The offset doesn't seem to work for all of these.

I do not see this issue in your project.
However, it may be a rounding error (based on dpi, resolution, height of divder, etc) of the browser because the divider is SVG, so it is dynamically scaled.
As mentioned by wwonderfull, you can workaround this by adding a negative margin. Or change the height of the divider with one or two pixels.