Mobile version of CSS

I am looking for a CSS developer to add mobile (phone and tabled) version ton an existing website/stylesheet using “@media” queries. I want all the major sections and functions of the website accessible to most phones and tablets format, while maintaining, when possible, the “look” of the web site (colour, fonts, etc.). Everything should be done using CSS. The developer won’t have access to the site back end/server so they will have to work using DevTools to modify the CSS. Once completed, I will upload the CSS to the server for testing. The website is: https://www.artinunat.com.