.presentation_generale::after
{
    width:100%;
    height:30vw;
    background:url(../admin/images/logo-spider-hd.png) no-repeat 50% 0;
    background-size:contain;
    opacity: 0.2;
    content: " ";
    position: absolute;
    left: 0px;

}
.message_client_non_configure
{
    width:100%;
    margin:30px auto;
    text-align:center;
    font-size:18px;
    color:#545454;
}