.swal2-toast {
    opacity: 0.8;
    -ms-filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=80);
    filter: alpha(opacity=90);
}

.swal2-toast:hover {
    opacity: 1;
    -ms-filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
    filter: alpha(opacity=100);
}