Use a fullstop "." at the beginning of a line to add a class. When using Tailwind in your client site this can add useful styling:
e.g. to center a heading instead of using the default for your stylesheet:
.text-center ## This is a centralised heading
e.g. to control width:
.w-full [This is a full width link](https://pullnote.com)
.text-red-600 This text is red
classes can be combined, to give e.g. 1/3 width centered
.text-center .w-1/3 content centrally aligned and taking up a 1/3rd of the available width