code: def set_clear_color(self, color='black', alpha=None):
          
          self.glir.command('FUNC', 'glClearColor', *Color(color, alpha).rgba)
docs: Set the screen clear color
  
          This is a wrapper for gl.glClearColor.
  
          Parameters
          ----------
          color : str | tuple | instance of Color
              Color to use. See vispy.color.Color for options.
          alpha : float | None
              Alpha to use.