openproject/app/assets/stylesheets/layout/_print.sass

/***** Media print specific styles *****/
@media print
  #top-menu,
  #header,
  #main-menu,
  #sidebar,
  #footer,
  .contextual,
  .other-formats
    display:none

  #main
    background: #fff

  #content
    width: 99%
    margin: 0
    padding: 0
    border: 0
    background: #fff
    overflow: visible !important

  #wiki_add_attachment
    display:none

  .hide-when-print
    display: none

  .autoscroll
    overflow-x: visible

  table.list
    margin-top: 0.5em

    th, td
      border: 1px solid #aaa