platform/packages/theme/styles/_print.scss

@media print {
  .no-print { 
    display: none !important;
  }

  .pagebreak { 
    page-break-before: always; 
  }
}

@media not print {
  .only-print {
    display: none !important;
  }
}

@mixin watermark {
  position: fixed;
  z-index: 9999;
  page-break-after: always;
}