As before, it was an error on a previous line in the CSS that was causing the problem.
Paulʼs blog - I live in A sleepy town, Kent. Wed + father to two, I am a full-stack web developr, + I do js / node, some ruby, other languages ect ect. I like pubs, parkrun, restaurants, home automation and other diy stuff, history, family tree stuff, telly, squirrels, pirates, lego, + time travel.