@7843eb9c - Yes, it seems to work! I'll ask @be22abe6 to add it to each of the 77 lectures - he's better at such things than I am!
@b4c50e1b @be22abe6 Sure, I guess it is only one file that needs editing that contains the header elements. It is such a cool site, thanks for putting it up!
@7843eb9c - actually it looks like every file contains this: <head> <link rel="stylesheet" type="text/css" href="the_style.css"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Spectral"> <style> body { font-family: 'Spectral', serif; font-size: 16px; } .center { display: block; margin-left: auto; margin-right: auto; } </style> </head> But Simon can change them. @be22abe6