.overlay_iwk {
    top: 0;
    content: '';
    background: rgba(0, 0, 0, 0.8);
    position: fixed;
    z-index: 2000;
    left: 0;
    right: 0;
    bottom: 0;
}


.popup_iwk {
    position: relative;
    width: 970px;
    margin: 0 auto;
    top: 30%;
}
a.close_cta {
    position: absolute;
    top: 0px;
    left: 933px;
    font-size: 20px;
    color: red;
    background: #ddd;
    padding: 5px 10px;
}
.popup_iwk_small {
    margin: 0 auto;
    position: relative;
    top: 30%;
    width: 300px;
}

a.close_cta_small {
    background: #ddd;
    color: red;
    font-size: 20px;
    left: 264px;
    padding: 5px 10px;
    position: absolute;
    top: 0;
}

.popup_iwk_small, a.close_cta_small {
  display: none;
}
.popup_iwk, a.close_cta {
  display: block;
}
@media (min-width:320px) and (max-width:768px) {
    .popup_iwk_small {
    display:block;    
    }
    a.close_cta_small {
    display:block;
    }
    .popup_iwk {
    display:none;    
    }
    a.close_cta {
    display:none;
    }
}*/