.dialog-background {
    background-color: #000;
    bottom: 0;
    cursor: default;
    left: 0;
    position: fixed;
    right: 0;
    top: 0;
    z-index: 19;
    filter: progid:DXImageTransform.Microsoft.Alpha(opacity=50); /* IE 5.5+*/
    -moz-opacity: 0.5; /* Mozilla 1.6 � ���� */
    -khtml-opacity: 0.5; /* Konqueror 3.1, Safari 1.1 */
    opacity: 0.5; /* CSS3 - Mozilla 1.7b +, Firefox 0.9 +, Safari 1.2+, Opera 9+ */
}

.dialog-body {
    left: 0;
    right: 0;
    position: fixed;
    z-index: 20;
    display: flex;
    justify-content: center;
    align-items: center;
    top: 0;
    bottom: 0;
    margin: auto;
}