1 iframe {

     2     overflow: hidden;

     3 }

     4 .document {

     5     max-width: 800px;

     6     margin: .5em auto;

     7     padding-left: 210px;

     8     padding-right: 10px;

     9     overflow: hidden;

    10 }

    11 #sidebar { position: fixed; }

    12 iframe { border: none; }

    13 #sidebar, iframe {

    14     top: 0;

    15     left: 0;

    16     width: 200px;

    17     height: 100%;

    18 }

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

    20     .document {

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

    22         padding: 0;

    23     }

    24     #sidebar { position: inherit; }

    25     #sidebar, iframe {

    26         width: 100%;

    27         height: 7em;

    28     }

    29 }