Uploading HTML and CSS files

Hello, I am new to WordPress and have been tasked with updating a website that is powered by it. I have currently designed a new version of said website using HTML and CSS files that I coded, and would like to upload those for use instead of the current theme that is being used for the site. I’m a little confused as to how to do this and am having some difficulty finding ways to do so. Any help would be appreciated, thank you!


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