Problem with Images

Welcome to the forums @AnnaVarda

The only issue I see with CSS is the 404 on /app.css. This is a hard-coded <link...> in public/index.html however the file app.css does not exist. The App.css in the src directory is imported into App.js

import './App.css';

I suggest you remove the <link href="/app.css" rel="stylesheet" type="text/css" /> from the public/index.html file.

Some of the pages aren’t working properly, for a couple of reasons.

  1. You need to put a _redirects file in public with the following
    /* /index.html 200
    This is explained in this section of Netlify’s documentation as well as this forum post.
  2. In the About.js page you have <a href=...> links instead of using <Link...> tags from react-router-dom as done in Navbar.js.
    I suggest changing all internal links to <Link...> and leaving <a href=...> for external links only.