Install node modules
npm install
Run live server to view the changes in the browser
npm start
Run the build for style.css
npm run build
also you can build a dev css to reload the page when you make changes in css file
npm run build:dev
You can modify all files in ./docs/ except the css file.
to modify css edit ./src/css/style.css
After build your css, your page will be located in ./docs copy an paste the folder where you need.