I also changed the color for the vertical bar on blockquotes to the same color to match.
Since I didn't like how light this was in the light scheme, I considered other colors than darkkhaki for --nav-highlight-color, but I kept coming back to darkkhaki for that. So instead I looked for another custom property to use for the color of the vertical bar, and after trying out currentColor, I settled on --visited-link-color. I like how it stands out in each color scheme, and previous comments usually share the feature with visited links of being previously read.
Since I didn't like how light this was in the light scheme, I considered other colors than darkkhaki for --nav-highlight-color, but I kept coming back to darkkhaki for that. So instead I looked for another custom property to use for the color of the vertical bar, and after trying out currentColor, I settled on --visited-link-color. I like how it stands out in each color scheme, and previous comments usually share the feature with visited links of being previously read.