body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    min-height: 100vh;
    background-color: #f4f4f4;
}

header {
    background-color: #333;
    color: white;
    padding: 1rem;
    text-align: center;
    width: 100%;
    position: fixed;
    top: 0;
}

.sidebar {
    width: 200px;
    background-color: #eee;
    padding: 1rem;
    margin-top: 60px; /* Offset for fixed header */
    position: fixed;
    height: calc(100% - 60px);
    overflow-y: auto;
}

.sidebar ul {
    list-style-type: none;
    padding: 0;
}

.sidebar li a {
    text-decoration: none;
    color: #333;
    display: block;
    padding: 0.5rem 0;
    cursor: pointer;
}

.sidebar li a:hover, .sidebar li a.active {
    background-color: #ddd;
}

.book-container {
    margin-left: 220px; /* Offset for sidebar */
    margin-top: 60px; /* Offset for header */
    padding: 1rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.page-view img {
    max-width: 100%;
    height: auto;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    border: 1px solid #ccc;
}

.navigation-controls {
    margin-top: 1rem;
    display: flex;
    justify-content: space-between;
    width: 100%;
    max-width: 800px; /* Adjust as needed */
}

.navigation-controls button {
    padding: 0.5rem 1rem;
    cursor: pointer;
}