I cannot get my taplist to scroll

I am trying to create a horizontal scrolling taplist that I can Chromecast from a web browser, but it seems that while I can adjust the text and format, I cannot create a horizontal board. Any suggestions?

See here: HOWTO: Turn a PC or generic browser into a Taplist.io display (advanced)

And: http://help.taplist.io/faq/why-does-my-list-look-different-on-desktopmobile