I am trying to deploy a full-stack project with a React frontend and an Express.js backend using Vercel. While everything works fine locally, I am encountering issues after deployment. Specifically, my backend routes are returning 404 Not Found errors. I am using the Unsplash API to fetch random photos and display it as a static background image for my React app.

I am trying to deploy a full-stack project with a React frontend and an Express.js backend using Vercel. While everything works fine locally, I am encountering issues after deployment. Specifically, my backend routes are returning 404 Not Found errors. I am using the Unsplash API to fetch random photos and display it as a static background image for my React app.