To use the css front you will be using the link below.
1.) To use the css font only use the check mark ( I’m uploading a font that is legal for web embedding. I checked with the author and/or EULA. ) link: https://www.web-font-generator.com/
2.) To upload use only the .tff
3.) Create a folder in your ftp.
4.) Then upload add the extension file example: style.css
5.) Make sure you use the right path so the font will 100% work correctly.