code: func parseCSS(filePath string) {
  	input := readFile(filePath)
  
  	stylesheet, err := parser.Parse(string(input))
  	if err != nil {
  		fmt.Println("Parsing error: ", err)
  		os.Exit(1)
  	}
  
  	fmt.Println(stylesheet.String())
  }
docs: // parse and display CSS file