This is a plain HTML + CSS site, does not use any javascript on the site itself. It has a minimal backend, that is written in Typescript, just to be able to send the emails for the contact us form.
It has a dark/light theme selector, unfortunatelly without javascript if you refresh the page the state will set back to default. The site has a menu that navigates in the same page to the given parts, the site is fully reponsive.