The 404 error suggests that the file path specified for your background image does not match the file's actual location on your server.

1. File Path Issue:

   • You are referencing the background image as:

   background: hsl(0, 0%, 90%) url("../wwwroot/data/Random.jpg") no-repeat 0 10px 20px;

However, in the Solution Explorer, the file Random.jpg is located in wwwroot/data/Random.jpg. Your path seems off.

2. Correct Path:

   • In ASP.NET Core applications, static files are served directly from the wwwroot folder.

   • The path wwwroot is the root of the static file server. So you don’t need to include wwwroot in the URL. Update the background image path to:

   background: hsl(0, 0%, 90%) url("/data/Random.jpg") no-repeat 0 10px 20px;

3. Ensure File Exists:

   • Verify that Random.jpg is located in the wwwroot/data folder.

   • You can access it directly in the browser by navigating to:

   http:///data/Random.jpg

4. Static File Middleware:

   • Ensure the UseStaticFiles() middleware is added in Program.cs (or Startup.cs) to serve static files from wwwroot:

   app.UseStaticFiles();