CSS in Golang not being served

I’m trying to include CSS in my Golang application to render it on a Web browser.

In order to do that, I’ve created a file structure as follows :

• Asset (containing all sorts of assets for my app)
• css (containing a single styles.css file)
• HTML (containing all my .html files)

They are located in the main folder, which also contains a main.go file and .txt files that serve as a library.

Also see picture below:

Inside my HTML files, I’ve included a stylesheet as follows :

<link rel="stylesheet" type="text/css" href="/css/styles.css">

and Inside my main.go file I’ve included this code to serve the files to the webserver :

css := http.FileServer(http.Dir("css"))
http.Handle("/css/", http.StripPrefix("/css/", css))

Although, I seem to be missing something, and after extensive search I’m still not finding it. I did find a question relative to that here, but the question was very poorly written and the answer too specific.

For reference, here’s my main function in main.go :

func main() {

font("standard")

http.HandleFunc("/program", handler)
http.HandleFunc("/400", charHandleError)
http.HandleFunc("/500", internalServerError)

fs := http.FileServer(http.Dir("Asset"))
http.Handle("/static/", http.StripPrefix("/static/", fs))

css := http.FileServer(http.Dir("css"))
http.Handle("/css/", http.StripPrefix("/css/", css))

http.Handle("/", noHandler())

addr := ":8001"

go func() {
    log.Println("Server started on http://localhost" + addr + "/program")
}()

http.ListenAndServe(addr, nil)

}