body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #f5f6f6;
}

header {
    width: 100%;
    background-color: #e3e4e4;
    padding: 5px 0;
    text-align: center;
    vertical-align: middle;
}

#logo {
    height: 20px;
}

.flipbook-container {
    width: 100%;
    max-width: 1050px;
    margin: 20px 0;
    position: relative;
}

#flipbook {
    width: 100%;
    height: 100%;
}

.navigation {
    display: flex;
    justify-content: center;
    margin-top: 20px;
}

button, input {
    margin: 0 10px;
    padding: 10px;
    width: 80px;
}

.page {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
}