How do I center a certificate on 8.5 x 11 paper?

[Denise]

When printing a certificate the left and right margins are different. Left
is 1/8 inch and the right is 1/2 inch. How can I center the certificate?

 

[Echo S]

When printing a certificate the left and right margins are different. Left
is 1/8 inch and the right is 1/2 inch. How can I center the certificate?

Margins are wrong, printout is off-center, I don't want any margins
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