Edit: CSS overflow

[Jamesllllllllll]

Description

This is a new PR for the correct file. The previous PR was incorrectly editing the main overflow term page located at /content/css/concepts/overflow/overflow.md - but this one is editing the correct file at /content/css/concepts/overflow/overflow/overflow.md

Issue Solved

Closes #4415

Type of Change

• Editing an existing entry (add media)

Checklist

• [x] All writings are my own.
• [x] My entry follows the Codecademy Docs style guide.
• [x] My changes generate no new warnings.
• [x] I have performed a self-review of my own writing and code.
• [x] I have checked my entry and corrected any misspellings.
• [x] I have made corresponding changes to the documentation if needed.
• [x] I have confirmed my changes are not being pushed from my forked main branch.
• [x] I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• [x] I have linked any issues that are relevant to this PR in the Issues Solved section.

[Jamesllllllllll]

Hey @helfese and @avdhoottt - I closed my previous PR because it was editing the wrong file. This new PR is editing the correct file!

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