/* main.css */
body {
  margin: 2em;
  color: #fff;
  background-color: #000;
}

/* override styles when printing */
@media print {
  @page {
    margin: .5cm;
  }
  body {
    margin: 1.6cm;
    color: #000;
    background-color: #333;
  }
  header, footer {
    display: none !important;
  }
  .panel {
    page-break-before: always;
  }
}