1  @media print {
 2    .book-menu,
 3    .book-footer,
 4    .book-toc {
 5      display: none;
 6    }
 7  
 8    .book-header,
 9    .book-header aside {
10      display: block;
11    }
12  
13    main {
14      // Fix for https://bugzilla.mozilla.org/show_bug.cgi?id=939897
15      display: block !important;
16    }
17  }