Printing invoice using 58mm printer

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If you want to display code or logs please surround it by three ` like this:

<?php echo $code_example; ?>
    @page { sheet-size: 58mm 200mm; }
            @page { sheet-size: 80mm 200mm; }
            p {
    font-size: 4vw;

I have edited the custom css file and posted the above code but after print the items are unreadable. What am i missing here?