page/page.go
func (p PrintToPDFParams) WithPaperWidth(paperWidth float64) *PrintToPDFParams {
	p.PaperWidth = paperWidth
	return &p
}
func (p PrintToPDFParams) WithPaperWidth(paperWidth float64) *PrintToPDFParams {
	p.PaperWidth = paperWidth
	return &p
}
// WithPaperWidth paper width in inches. Defaults to 8.5 inches.