code: func Margins(top, bottom, left, right float64) PrintToPDFOption {
  	return func(o map[string]interface{}) {
  		o["marginTop"] = top
  		o["marginBottom"] = bottom
  		o["marginLeft"] = left
  		o["marginRight"] = right
  	}
  }
docs: // Margins sets the margin sizes for PrintToPDF