div#content {
    background-color: #F3F2F0;
    background-image: url("../images/bg-content.png"), url("../images/bg-alumni-01.jpg"), url("../images/bg-alumni-02.jpg");
    background-position: left 350px, left top, right top;
    background-repeat: no-repeat;
}

div#content {
    -pie-background: url("https://www.unistra.fr/fileadmin/templates/unistra-v2/images/bg-content.png") no-repeat left 350px, url("https://www.unistra.fr/fileadmin/templates/unistra-v2/images/bg-alumni-01.jpg") no-repeat left top, url("https://www.unistra.fr/fileadmin/templates/unistra-v2/images/bg-alumni-02.jpg") no-repeat right top;
}