I use Bootstrap as basis for my style sheets. If I want something to look different as defined in the bootstrap.css or bootstrap-theme.css I simply override it in my custom CSS files, that are loaded after the Bootstrap files. But now I have following case:
bootstrap.css
@media print {
    *,
    *:before,
    *:after {
      background: transparent !important;
      color: #000 !important;
      box-shadow: none !important;
      text-shadow: none !important;
    }
    ...
}
I want, that the background for printing is the same as for the screen.
How can I "reset" the background directive of Bootstrap (without to touch the bootstrap.css)?