sass-site/source/assets/stylesheets/_print.scss

@media print {
  * {
    background: transparent !important;
    box-shadow: none !important;
    color: black !important;
    text-shadow: none !important;
  }

  a {
    &,
    &:visited {
      text-decoration: underline;
    }

    &[href]:after {
      content: " (" attr(href) ")";
    }

    .ir &,
    &[href^="javascript:"],
    &[href^="#"] {
      &:after {
        content: "";
      }
    }
  }

  pre {
    border: 1px solid #999999;
    page-break-inside: avoid;
  }

  tr,
  img {
    page-break-inside: avoid;
  }

  img {
    max-width: 100% !important;
  }

  @page {
    margin: 0.5cm;
  }

  p,
  h2,
  h3 {
    orphans: 3;
    widows: 3;
  }

  h2,
  h3 {
    page-break-after: avoid;
  }
}