My friends and I occasionally joke that the worse a professor's/programmer's/scientist's personal university webpage, the better they are at their actual profession.
It's not the worse mathematician homepage I've seen, by a grand margin. Mine is only marginally better, and I have more to blame since I know what I do when I do webpages :)
When I was in academia, I just used Word (and "Export to HTML") to create my university homepage. Even back then, I knew it was ugly as sin, but I had other things to worry about.
I still don't have a very good sense of design, but I can use Bootstrap. That's good enough.
did you look at the source, that was written by a mathematician, he took careful care to calculate out every pixel of padding and space. Probably for his specific monitor :)