.popup {
    display: none; 
    position: fixed; 
    z-index: 9999; 
    left: 0; 
    top: 0; 
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgb(0,0,0); 
    background-color: rgba(0,0,0,0.4); 
}
.popup-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 600px; 
    z-index: 999;
}
.close-btn {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}
.close-btn:hover,
.close-btn:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}
.hidden{
    display: none;
}
.disabled {
    text-decoration: none; /* Remove underline */
    cursor: not-allowed; /* Show not-allowed cursor */
    pointer-events: none; /* Disable pointer events */
}
@media only screen and (max-width: 998px){
    .popup-content {
        margin: 15% 20%;
    }
}