Creating Custom Style.css file through javascript

I am having issues with styling the CSS of editor X elements like( containers etc ) so that when I try to style the container in custom CSS by getting the container class from inspect element, all other container’s style changes with that code. So, now I want to create a style.css file in editor files so I can have access to all the CSS of the website.

If someone is confused about what I am saying then actually I want to create a Style.css in editor X developer files with javascript, So can have access to the entire CSS of the website

Note: I am not using Velo.

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