Big letters, small letters

Apologies for the random font sizes that are now on the blog. I read this very interesting and useful article, which said you should make your online fonts bigger. And it does make a huge difference. So I've changed my default font size. The trouble is, a lot of the articles were not using 'default', but I had specifically set the size to 'normal'. Which gave the same result. But now that the default's bigger, those ones haven't changed.