#colonnecentrale {position: absolute;
            z-index:1;
            left: 50%;
            width: 1004px;
            margin-left: -502px;
            margin-top: 10px;
            border: 0px solid blue;
            }
#navigateurs {position: absolute;
      z-index:1;
      margin-top: 410px;
      margin-left: 150px;
      width: 750px;
      height: 20px;
      color: gray;
      font-size: 12px;
      text-align: center;
      }
#box_films {
    position:absolute;
    z-index: 102;
    width: 720px;
    height: 570px;
    margin-left: 100px;
    margin-top: 50px;
}
#navigateurs2 {position: absolute;
      z-index:1;
      margin-top: 450px;
      margin-left: 150px;
      width: 750px;
      height: 20px;
      color: gray;
      font-size: 12px;
      text-align: center;
      }