.popup-template .modal
{
    opacity: 0;
    -webkit-transition: all 250ms ease;
    -o-transition: all 250ms ease;
    transition: all 250ms ease;
}
.popup-template .modal.is-open
{
    opacity: 1;
    -webkit-transition: all 250ms ease;
    -o-transition: all 250ms ease;
    transition: all 250ms ease;
}