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There could be several reasons:

1. Incorrect file paths: Double-check to make sure you have the correct file path for your CSS file. If it’s in a separate folder or a subdirectory, the file path will need to reflect that.

2. Typos: Make sure you don’t have any typos in your code. One extra character or an incorrect spelling could break the entire link.

3. Incorrect file extension: Make sure your CSS file is saved with a “.css” file extension. If it’s saved with a different extension, the HTML file won’t be able to recognize and link it.

4. Incorrect linking syntax: You’ll need to make sure you’ve used the correct syntax to link your CSS file to your HTML file. The syntax should begin with <link rel="”stylesheet”" href="”styles.css”&gt;&lt;/p">

5. Cache issues: Your browser might have cached your previous file, preventing it from loading with the updated CSS. Try clearing your browser’s cache and reloading the page.

6. Server issues: Sometimes the server hosting your files may have issues that prevent the file from being served correctly. Check your server logs or contact your web host to see if there are any server-side issues.