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 To check whether a CSS file is properly linked and applied to an HTML file, you can follow these steps:

Open Your HTML File:

   Open the HTML file in a web browser. You can do this by double-clicking the HTML file or by using the browser's "Open File" option from the menu.

Inspect Element:

   Right-click on an element on the webpage that you suspect should have styling applied from the CSS file. In the context menu that appears, select "Inspect" or "Inspect Element." This will open the browser's Developer Tools.

Check Applied Styles:

   In the Developer Tools panel, you will see the HTML code of the page along with a "Styles" or "Elements" tab. The "Styles" tab will display the applied styles for the selected element. It will show both inline styles and styles from linked CSS files.

   - Look for the element you're inspecting on the left side of the panel.

   - On the right side, you'll see a list of CSS rules that apply to the selected element.

   - Each rule will display the property and its value, showing the computed styles that are affecting the element's appearance.

Check CSS File Link:

   If you want to confirm whether your CSS file is correctly linked, you can do the following:

   - In the "Elements" or "Inspector" panel, find the `<link>` tag you used to link the CSS file. It will be listed in the HTML code under the "head" section.

   - Check if the `href` attribute points to the correct path of your CSS file. 

   If the path is incorrect, the browser will not be able to load the CSS file, and your styles won't be applied.

Debugging:

   If the styles are not being applied as expected, there could be various reasons:

   - Verify that the CSS file is in the same directory as the HTML file or that the path is correct.

   - Check for any typos or syntax errors in your CSS code.

   - Ensure that you've saved both the HTML and CSS files before refreshing the browser.

   - Clear your browser cache and try reloading the page.

By following these steps, you can check if your CSS file is properly linked to your HTML file and if the styles are being applied as intended. The Developer Tools in modern browsers are powerful tools for debugging and inspecting web pages, so don't hesitate to explore them to gain more insights into how your HTML and CSS are interacting.