.conteneurCourante {
position:absolute;
left: 50%; 
width: 1190px;
height: 500px;
margin-top: 0px;
margin-left: -710px;
border: 0px solid #000000;
z-index:1;
}
.conteneur {
position:absolute;
left: 50%; 
top: 50%;
width: 1410px;
height: 465px;
margin-top: -270px;
margin-left: -805px;
border: 0px solid #000000;
z-index:1;
}