I have looked on Google for a solution to change CSS properties of several
CSS elements of a page.

All solutions I have found are server-side solutions with cookies. What
I'm looking for is a client-side solution with a cookie to store user
preferences.

I just want to increase/decrease font-size for body, and width (780px or
100%) for a div tag.
Is there a JavaScript that does this or something similar and stores the
preferences on the user's computer?

Thanks,

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