Run the presentation by using the npm start
command
Reveal.js itself has print/PDF support, but then the style is different from the real presentation.
Decktape seems to give nicer results. In order to run decktape do the following:
npm install decktape
./node_modules/decktape/decktape.js --size 1920x1200 reveal http://localhost:8001/ practical-security.pdf