.overlay{
    background-color:#a8a8a8a9;    
    bottom: 0;
    left: 0;
    position: fixed;
    right: 0;
    top: 0;
    display: none;    
}
.overlay.is-open{
    display: block;    
}
.popup{
    /*background-image: url(../img/popup.png);*/
    background-color: rgb(43, 43, 43);
    position: relative; 
    top: 70%;
    left: 50%;
    transform: translate(-50%, -50%);   
    padding: 20px;
    box-shadow: 0px 2px 5px 5px rgba(0,0,0,0.1);
    transition: all 2s ease-in-out; 
    width:60%;
    z-index: auto;
    border-radius: 30px;
}
@media only screen and (max-width: 600px) {
    .popup{
        width:90%;
     }
   }
@media only screen and (max-width: 780px) {
    .popup{
        width:90%;
     }
   }
   .popup .close-btn{
    background: #000;
    border-color: #000;
    border-radius: 5px;
    cursor: pointer;
    color: aliceblue;
}
    .popup .close-btn:hover{
        background: #494949;
        border-color: chartreuse;
        color: #ffffff;        
    }