Update basic-css.json

[ghost]

Description

As on line no 5600 there was an error, the line was written as, "You can think of the :root element as a container for your entire HTML document, in the same way that an html element is a container for the body element.", And change to: "You can think of the :root element as a container for your entire CSS document, in the same way that an html element is a container for the body element.",

Pre-Submission Checklist

• [x] Your pull request targets the dev branch.
• [x] Branch starts with either fix/, feature/, or translate/ (e.g. fix/challenge-tests)
• [x] All new and existing tests pass the command npm test.
• [x] Use npm run commit to generate a conventional commit message. Learn more here: https://conventionalcommits.org/#why-use-conventional-commits
• [x] The changes were done locally on your machine and NOT GitHub web interface. If they were done on the web interface you have ensured that you are creating conventional commit messages.

Checklist:

• [x] Tested changes locally.
• [x] Addressed currently open issue (replace #315 with an issue no in next line)

Closes #315

[scissorsneedfoodtoo]

Thank you for taking the time to submit a PR for this issue. Unfortunately, a fix was just merged with https://github.com/freeCodeCamp/curriculum/pull/315. Please check out our other open issues, and we're looking forward to your next contribution!