/* Navigationsleiste */
.navbar {
    overflow: hidden;
    background-color: #333;
    padding: 10px;
}

.navbar a {
    float: left;
    color: #fff;
    text-align: center;
    padding: 14px 20px;
    text-decoration: none;
    font-size: 16px;
}

.navbar a:hover {
    background-color: #ddd;
    color: #000;
}

/* Hauptinhalt */
.container {
    margin: 20px;
}

/* Popup-Fenster */
.popup-img {
    display: none;
    position: fixed;
    z-index: 999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.8);
}

.popup-content {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}

.popup-img img {
    max-width: 90%;
    max-height: 90%;
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}