I've dedicated my free time last week to improving this website. I made it myself from scratch more than 10 years ago, using some old version of PHP, MySQL, and HTML 4.01, so it definitely needed some refresh. I introduced many changes to the code, most notably:
<table>and applying rules of "responsive design". By the way, I also limited maximum width of the page to make it more convenient to read on big screens.
There are still things to do. The website, as well as database, still uses ISO-8859-2 codepage instead of UTF-8 (it was a standard for encoding Polish characters before Unicode became popular). The scripts still generate the page using lots of
print()-s instead of some template system. But maybe I will fix that next time :)