Make the theme printable

[AlexisTM]

By adding page-break-inside: avoid; to the card-nested CSS, the theme becomes printable with nice transitions.

  .card-nested {
    min-height: 0;
    border-width: 1px 0 0 0;
    page-break-inside: avoid;
  }

By adding the following CSS, the border of the background is not visible while printing.

  @media print {
    .background-card {
      border: none;
    }
  }

[mudassir0909]

Thanks for the suggestion, I'll have a look tonight plus I realised that the icons don't render anymore :O