Increase Width of Workspace Divider

What I’m trying to do

I’m trying to increase the width of the border line that separates workspaces.

Notice in this screen capture the dividing line is feint - it should be much thicker

Things I have tried

I’m using the Minimal theme, didn’t see any setting for this. I tried the following snippet recommended by Chat-GPT but that didn’t work:

:root {
–border-width: 20px;
}

The Border Theme has something it calls the ‘Cards’ layout that I think is something close to what you’re after