Good job. I’m brushing up on CSS as I write this, but you can copy all of the CSS info (should be delimited by a /style tag) into a new file with a .css extension (probably a good idea to store the style sheets in a separate ‘css’ directory), and then use a link command to refer to the CSS. For instance, call the new file ‘style.css’, then use the command <link rel=”stylesheet” href=<directory_name>/style.css”>.
I recommend making a copy of the files that you modify, in case something goes awry.
Good luck.