#colonnecentrale  {
 position: absolute;
 left: 50%;
 top:10;
 width: 994px;
 /* height: 520px;   */
 margin-left: -497px;
 border: 0px solid red;
 /*background-color: #54af69;
 background-color: #488647;    */
 background-color: #85935E;
}
#navigateurs {position: absolute;
      z-index:1;
      top: 525px;
      left: 0px;
      width: 994px;
      height: 20px;
      }