Hi, do you mean that the underline appears under the highlighted text? No, that's not expected, I will see what I could do to fix it. However, the underline is indeed supposed to grow slightly thicker on hover.
Yes, looked a bit weird. I do have an outdated web browser so there's that but I would assume this should work well even on older ones (due to the overall simplicity).
Sorry for nitpicking, this is obviously a very minor issue. I always welcome smaller and lighter libraries!
I've stretched out the line height a bit so it should look better now.