Can anyone help me figure out why my CSS page won't load when I launch my page on a local host?

The css works when I open the html page alone but when I try to launch the page using express it gives me this error.https://preview.redd.it/qzki83b1epw31.png?width=762&format=png&auto=webp&s=63fd953eefca2e2f82da46df04a896555e69ee68

Submitted November 04, 2019 at 05:20PM by retep04