How to add height and width to save_pdf?

[LouisDeconinck]

The documentation says that 'height' and 'width' are parameters for save_pdf.

I would like my pdf to have vertical A4 dimensions.

I have the following code:
save_pdf file: 'cards.pdf', heigth: 3508, width: 2480

This gives me the following error:
warning: Unexpected parameter 'heigth:' to save_pdf(). Accepted parameters: [:file, :dir, :sprue, :width, :height, :margin, :gap, :crop_marks, :crop_stroke_color, :crop_stroke_dash, :crop_stroke_width, :crop_margin_bottom, :crop_margin_left, :crop_margin_right, :crop_margin_top, :rtl, :trim, :trim_radius, :range]

What am I doing wrong and how can I fix it?

[LouisDeconinck]

I found the solution myself:
save_pdf file: 'cards.pdf', width: '210mm', height: '297mm'