.rTable {
  display: table;
  width: 100%;
}
.rTableRow {
  display: table-row;			
}
.rTableHeading {
  display: table-header-group;
  background-color: #ddd;
}
.rTableCell, .rTableHead {
  display: table-cell;
  padding: 3px 10px;
  vertical-align: middle;
  border: 0px;
}
.rTableHeading {
  display: table-header-group;
  background-color: #ddd;
  font-weight: bold;
}
.rTableFoot {
  display: table-footer-group;
  font-weight: bold;
  background-color: #ddd;
}
.rTableBody {
  display: table-row-group;
}
.center {
  text-align: center;
}
.pmarge
{
  margin-right:2%;
  margin-left:2%;
}
@media only screen and (min-width: 630px) {
  #book {
    float: left ;
    width: 50% ;
  }
  #content {
    float: left;
    width: 50%;
  }
}