Changes

     min-width:900px;        /* some minimum width is a good idea. */

     min-width:900px;        /* some minimum width is a good idea. */

     border-spacing:20px 0;  /* note that spacing is also applied to right and left ends */

     border-spacing:20px 0;  /* note that spacing is also applied to right and left ends */

     background-color:#666;

     background-color:#62B9E5;

     margin:0 auto;">

     margin:0 auto;">

     <div style="display:table-cell;

     <div style="display:table-cell;

     border:1px solid #bbb;

     border:1px solid #bbb;

     background-color:#eee;

     background-color:#eee;

     padding:30px;">Content for "leftdiv" Goes Here. </div>

     padding:30px;">

    </div>

     <div style="display:table-cell;

     <div style="display:table-cell;

     width:33%;

     width:33%;