Make sure you call:
npx tailwindcss -i ./src/style.css -o ./src/dist/style_out.css --watch
on where the path tailwind.config.js leads.
Recently added apache2 to serve my website
the document root path has been changed and configured for the service. You need to make sure that mol2db_web repo is going to be cloned at the right place. please look at the apache configuration files!