@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

#imagePopup {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1000; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
    animation: fadeIn 0.5s forwards;
}
#imagePopup.hide {
    animation: fadeOut 0.5s forwards; /* Apply fade-out animation */
}

.popup-content {
    margin: 15% auto;
    padding: 20px;
    background: white;
    width: 80%;
    max-width: 600px;
    text-align: center;
}

.popup-content img {
    width: 100%;
    height: auto;
}