#popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    /* Transparenter Hintergrund */
    z-index: 1000;
    /* Popup über anderen Inhalten */
    align-items: center;
    justify-content: center;
    text-align: center;
}

#popup-content {
    display: none;
    color: #66ffcc;
    background-color: #2a3d45;
    padding: 20px;
    border-radius: 8px;
    width: 80%;
    max-width: 400px;
}

#close-symbol {
    display: none;
    position: absolute;
    top: 5px;
    right: 10px;
    font-size: 30px;
    cursor: pointer;
}