.overlay-modal {
    background: #000000;
    background: rgba(0, 0, 0, 0.5);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#80000000, endColorstr=#80000000);
    -ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#80000000, endColorstr=#80000000)";
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    z-index: 99999;
}

.moustic-api-modal {
    position: fixed;
    left: 50%;
    top: 50%;
    z-index: 99999;
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}