/**/
.ui-dialog-titlebar-close {
    padding:0 !important;
    float:right;
}

.ui-dialog-titlebar-close:after {
    content: '';
    width: 15px;
    height: 15px;
    display: inline-block;
    /* Change path to image*/
    /*
    background-image: url(https://boutique.ucm.be/StarterWeb/public/css/pageAccueil2017/themes/base/images/ui-icons_777777_256x240.png);
    */
    background-image:url('https://boutique.ucm.be/StarterWeb/public/javascript/jquery/css/smoothness_custom/images/ui-icons_ffffff_256x240.png');

    background-position: -96px -128px;
    background-repeat: no-repeat;
    background-color: #003F58;
    border:1px solid #003F58;
}

button{
    border: 2px solid #003F58;
    padding: 5px 5px;
    font-size: 8pt;
    font-weight: bold;
    background-color: #003F58;
}