body {
  background: rgb(204, 204, 204);
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

main {
  background: white;
  display: block;
  margin: 0.5cm auto;
  box-shadow: 0 0 0.5cm rgba(0, 0, 0, 0.5);
  width: 21cm;
  height: 29.7cm;
  position: relative;
}

@media screen and (max-width: 21cm) {
  main {
    width: 100vw;
    height: calc(100vw * 29.7 / 21);
    margin: 0;
    box-shadow: none;
    min-width: 450px;
    min-height: 642px;
  }
}

@media print {
  body {
    background: white;
    margin: 0;
    display: block;
  }

  main {
    margin: 0;
    box-shadow: none;
    width: 21cm;
    height: 29.7cm;
    page-break-after: always;
    page-break-inside: avoid;
  }

  @page {
    size: A4;
    margin: 0;
  }

  /* Règles pour conserver les couleurs lors de l'impression */
  header {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
    background-color: #243d45 !important;
    color: #fff !important;
  }

  aside {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
    background-color: #cdd6d8 !important;
  }

  aside h3 span {
    background: #cdd6d8 !important;
  }
}