If you want to showcase a Nixie Tube / Cold Cathode Display inspired content on your site, have a look at this snippet by Kent Nguyen, it displays a random number every few seconds.
If you are having trouble with the pen, try the archived copy on GitHub
Cold Cathode Display / Nixie Tube Snippet
See the Pen Nixie Tubes by Kent Nguyen (@rukouen) on CodePen.0