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Yes, it is possible to edit the existing HTML code and add new classes to a website. Here are the steps you can follow:

1. Open the HTML file you want to edit in a code editor or text editor.

2. Look for the section of the HTML code where you want to add new classes. You can identify the section by searching for the relevant HTML tags or elements.

3. Once you have found the section, add the new class name to the class attribute of the relevant HTML tag or element. For example, if you want to add a class named "new-class" to a div element, you would add it like this:

   <div class="old-class new-class">

4. Save the changes to the HTML file.

5. Test the changes by opening the edited HTML file in a web browser to see if the new classes are being applied correctly.

Note that it is important to make sure that any changes you make to the HTML code do not break the existing functionality of the website. It is also recommended to create a backup copy of the original HTML file before making any changes.