#colonnecentrale {position: absolute;
            z-index:1;
            left: 50%;
            top:10px;
            width: 994px;
            height: 1100px;
            margin-left: -502px;
            /* margin-top: -350px;    */
            border: 0px solid red;
            background-color: #E29900;
            }
#navigateurs {position: absolute;
      z-index:1;
      margin-left: -502px;
      width: 994px;
      height: 20px;
      left: 50%;
      top:1075px;
      }
#avertissement {position: absolute;
      z-index:99999;
      margin-top: 400px;
      margin-left: 30px;
      width: 199px;
      height: 150px;
      color: yellow;
      font-size: 14px;
      text-align: center;
      }