Printing certificates

Hi, I have looked at a couple of posts on printing certificates and because my e-learning is going to be used by people in varying situations e.g locally, on their LMS and on a company network I decided to use the java script window.print();

When I run the e-learning locally on my PC the certificate displays on the screen perfectly and the print button appears to work, as the print dialogue box comes up and you can select the printer but the printer prints a blank page.

Please can anyone help with this?

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