There are a few reasons why your JavaScript might only be working with one class.

• You might be targeting the wrong class. Make sure that you are targeting the correct class in your JavaScript code. You can do this by checking the HTML code to see what class is being applied to the element that you want to target.
• You might be using the wrong selector. When you are targeting a class in JavaScript, you need to use the . selector. For example, if you want to target the .my-class class, you would use the following selector:

document.querySelector('.my-class');

• You might be using the wrong method. JavaScript has a number of different methods that you can use to target classes. The method that you need to use will depend on what you want to do with the class. For example, if you want to add a class to an element, you would use the classList.add() method.

Here is an example of how you would use the classList.add() method to add the my-class class to an element:

const element = document.querySelector('.my-element');
element.classList.add('my-class');

If you are still having trouble getting your JavaScript to work with multiple classes, you can try using a JavaScript debugger to step through your code and see what is happening. A JavaScript debugger will allow you to see the value of variables, the state of the DOM, and the execution of your code line by line. This can be a helpful way to troubleshoot problems with your JavaScript code.