.popup_body_box_class{
    position: fixed;
    z-index: 11000;
    background: rgba(0, 0, 0, 0.21);
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
}
.popup_body_box_class.open_popup{
    opacity: 1;
    visibility: visible;
    transition: all 0.4s;
    -webkit-transition: all 0.4s;
    -moz-transition: all 0.4s;
    -ms-transition: all 0.4s;
    -o-transition: all 0.4s;
}
.popup_body_box_class .popup_box{
    width: 500px;
    height: 500px;
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 0 10px #000;
    background: #fff;
}