4 }

     5 iframe {

     6     overflow: hidden;

     7 }

     8 .document {

     9     max-width: 800px;

    10     margin: .5em auto;

    11     padding-left: 210px;

    12     padding-right: 10px;

    13     overflow: hidden;

    14 }

    15 #sidebar { position: fixed; }

    16 iframe { border: none; }

    17 #sidebar, iframe {

    18     top: 0;

    19     left: 0;

    20     width: 200px;

    21     height: 100%;

    22 }

    23 @media (max-width: 780px) {

    24     .document {

    25         margin: 5px 10px 1em 10px;

    26         padding: 0;

    27     }

    28     #sidebar { position: inherit; }

    29     #sidebar, iframe {

    30         width: 100%;

    31         height: 7em;

    32     }