#popup {
    width: 100%;
    height: 100vh;
    background-color: rgba(0,0,0,0.7);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 10010;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
#popup .popup_in {
    position: relative;
/*    width: 600px;*/
/*    height: 600px;*/
}
#popup a.btnclose {
    display: block;
    position: absolute;
    /*top: 50%;
    right: -50px;*/
    bottom: -35px;
    right: 0;
}
@media (max-width:750px) {
    .popup_in {
        width: 80vw;
    }
}