Run from the command line in the htdocs folder of this rep:
php -S localhost:8000
Then visit the URL in a browser. The used php version is 8.
Css compiling is done with gulp (https://gulpjs.com/). Make sure to use the correct node-version (lts/fermium) when running gulp. This can be done with nvm (https://github.com/nvm-sh/nvm). Run "npm ci" to make sure the correct package versions will be used, from "package-lock.json".
nvm use
npm run install
See license here