You'll find several different generators on the site. There is also a gallery of ready-to-use effects next to each generator.
Choose a predefined style from the gallery or generate an effect according to your preferences. Configure the desired attributes to get the CSS code. Download the generated code and use it in your own project.
There are three sections on the website - html, css and js. You will also find an interesting SEO cheat sheet and a checklist there. The SEO Cheat Sheet and the checklist are very interesting, although they are hard to find on the website.