@MitchW You can modify that snippet to whatever you want. Add more spacing at the top by increasing 3em, add more spacing at the bottom by increasing 1em. Leave the "0" as is.
You can also increase the thickness of the line, modify the style (can use "dotted" or "dashed" instead of "solid"), and change the color. I set it to the link variable, but you can erase all that and use any hex value you like (such as #00FFEE or whatever).
If that's all confusing or you have something more specific in mind, let me know.