Mobile phones at was designed and developed to work on computers, laptops, tablets, etc., not on mobile phones.
I have quite honestly neither the time nor money to make the site much more mobile-friendly, but that need not stop you from making good use of it.

Most pages should be presented either like this one, not a problem with this text hopefully word-wrapped to fit into your phone’s teeny-weeny display area (c 5 cm wide), or at least with text large enough to read on your diminutive device.

For example, data on this site’s welcome page is 800 pixels wide. A smartphone display covers only 360 pixels horizontally. Here are some ways of dealing with that sort of issue.

(Philip Tagg, Liverpool 2018-08-27