Mega Menu Breaks, CSS3

I developed a ReactJS application using CSS3 and Visual Studio with Copilot. After a month, the layout shifted, moving 25% down from its original position. Attempts to reposition it have failed. The navigation links function correctly, but React Router appends to the browser URL, repeatedly adding "/Home/PageSting" to the address (e.g., http://localhost:3000/Home/PageSting/Home/PageSting...). I've also consulted the Microsoft Copilot documentation for assistance.

James Avakian, ReactJS Software Engineer, Optical Automation, LLC

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