body {
    background-image: url("asset/fond_caiiros.jpg");
    /* background-color: rgb(90, 90, 90); */
    background-position:center center;
    background-attachment:fixed;
    background-repeat:no-repeat;
    background-size: contain;
    background-size: 100.0%;
}



.logo_centre{
    position: absolute;
    z-index: 2;
    scale: 0.1;
    width: 100%;
    height: 20%;
    text-align: center;
}