#colonnecentrale {
            position: absolute;
            z-index:1;
            top:10px;
            left: 50%;
            width: 980px;
            height: 520px;
            margin-left: -490px;
            padding: 0px;
            border: 1px solid orange;
            background-color: #ffffff;
            }
#box_bottom {
            position: absolute;
            z-index:1;
            top: 359px;
            left: 50%;
            width: 980px;
            height: 160px;
            padding: 0px;
            margin-left: -490px;
            border: 1px solid orange;
            background-color: #462700;
            }
#navigateurs {position: absolute;
      z-index:1;
      top: 530px;
      margin-left: 10px;
      width: 980px;
      height: 20px;
      color: white;
      font-size: 9px;
      font-family: "Arial";
      text-align: center;
      }