.ui-widget.ui-widget-content {
    border-radius:0;
}

.ui-dialog .ui-dialog-titlebar-close {
    width:30px;
    height:30px;
    right:10px;
    top:10px;
}
.ui-button.ui-dialog-titlebar-close  .ui-icon {
    background:none;
    width:100%;
    height:100%;
    right:0;
    left:auto;
    top:10px;
}
.ui-button.ui-dialog-titlebar-close  .ui-icon:before {
    content:'X' !important;
    font-family: inherit;
    text-indent:0;
    display:block;
    width:30px;
    height: 30px;
    color:#333 !important;
}
.ui-dialog-titlebar-close::before {
    /*content:'X';
    font-family: inherit;*/
}