Screen printing distorted

Hello, I would like to avoid trainee to print out a diploma. Thanks to Javascript and some variables, all the content of the diploma is ok and is well displayed on the screen.

But when I use the Javascript : window.print(); the printing is distorted to fit an A4 portrait page.

As I seen, it will be not possible to change the print setting in Javascript, so how can I print the screen thanks a button in the content whitout distortion?

Thanks,

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