Using this snippet by soren you can add an active link indicator to your webpage. When you click on a link the underscore effect moves on to that link, it’s useful when you want to show your visitors which link out of a given set of links are currently active, it’s especially useful for navigation menus and such.
If you are having trouble with the pen, try the archived copy on GitHub
Active Link Snippet
See the Pen nick drake current link indicator by soren (@ohsoren) on CodePen.0