A bunch of pure CSS underline effects that can be used for linksIOS Invisible Ink On Websites on your webpages, these were designed by Jordan Marshall. The effects include: a rainbow, slanted rainbow, shrinking underline, growing underline, double underline, triple underline, dotted underline, weave underline, various shades, etc

If you are having trouble with the pen, try the archived copy on GitHub

See the Pen
Cool CSS Underline Effects
by Jordan Marshall (@TheCSSKing)
on CodePen.