key,_ := totp.Generate(totp.GenerateOpts{ 
              AccountName: "XYZ Test", 
              Issuer: "some.domain.com", 
              Algorithm: otp.AlgorithmSHA512, 
        })
        
        var buff bytes.Buffer
	img, _ := key.Image(256,256)
	f, _ := os.Create("test.html")
	png.Encode(&buff, img)
	encodedString := base64.StdEncoding.EncodeToString(buff.Bytes())
	htmlImage := "<img src=\"data:image/png;base64," + encodedString + "\" />"
	l, err := f.WriteString(htmlImage)
	if err != nil {
		log.Println(err)
	}