body {
    background-color: black;
    margin: 0;
    padding: 0;
}.header {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

.header-item {
    flex: 0 0 calc(33.33% - 4px); /* 3 Spalten */
    margin: 2px;
}

.header-img {
    width: 100%;
    height: auto;
    cursor: pointer;
}
.container {
    max-width: 100%;
    overflow-x: hidden;
    background-color: black;
}

.gallery {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.book {
    text-align: center;
    flex: 0 0 calc(100% / 3 - 4px);
    margin: 2px;
}

.book img {
    max-width: 100%;
    height: auto;
}
.popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5); /* Rosa Hintergrund mit 50% Transparenz */
    z-index: 9999;
}

.popup-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgb(0, 0, 0);
    padding: 20px;
    text-align: center;
}

.popup-content p {
    margin-bottom: 20px;
    color: rgb(182, 163, 116); /* Goldene Schriftfarbe */
    text-transform: uppercase; /* Großbuchstaben */
}

#confirmButton {
    background-color: rgb(182, 163, 116); /* Grüner Hintergrund */
    color: white; /* Weiße Schriftfarbe */
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.3s;
}

#confirmButton:hover {
    background-color: rgb(182, 163, 116); /* Dunkelgrüner Hintergrund bei Hover */
}