vuepress-theme-system/styles/system/print.css

a vuepress theme

/*
    Print
-------------------------------

From HTML5 Boilerplate
https://github.com/h5bp/html5-boilerplate/blob/master/src/css/main.css

Black prints faster: http://www.sanbeiji.com/archives/953
*/

@media print {
  *,
  *::before,
  *::after,
  *::first-letter,
  *::first-line {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

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

  a[href]::after {
    content: ' (' attr(href) ')';
  }

  abbr[title]::after {
    content: ' (' attr(title) ')';
  }

  /*
  Don't show links that are fragment identifiers,
  or use the `javascript:` pseudo protocol
  */
  a[href^='#']::after,
  a[href^='javascript:']::after {
    content: '';
  }
}