page/page.go
func (p PrintToPDFParams) WithPreferCSSPageSize(preferCSSPageSize bool) *PrintToPDFParams {
	p.PreferCSSPageSize = preferCSSPageSize
	return &p
}
func (p PrintToPDFParams) WithPreferCSSPageSize(preferCSSPageSize bool) *PrintToPDFParams {
	p.PreferCSSPageSize = preferCSSPageSize
	return &p
}
// WithPreferCSSPageSize whether or not to prefer page size as defined by
// css. Defaults to false, in which case the content will be scaled to fit the
// paper size.