What are the main tools for creating the HTML and CSS files for a simple static site? I used to use jemdoc for an academic website. But now its documentation w

What are the main tools for creating the HTML and CSS files for a simple static site? I used to use jemdoc for an academic website. But now its documentation website has become a cryptocurrency website https://jemdoc.jaboc.net/ https://jemdoc.jaboc.net/ Python has also transition to python3. Also where to search for good CSS styles?