Your menu has a print button that lays it out properly for paper — plain, readable, without the screen furniture.
Use your browser's print dialog and choose "Save as PDF" to get a file instead of a printout.
Caterers use this to send a menu to a client, and kitchens use it to keep a copy by the pass. Because it prints your live menu, the PDF is correct on the day you make it — there is no second document to keep up to date.