.main-section {
    display: flex;
    height: calc(100vh - 450px); /* Adjust based on header/footer height */
    gap: 20px; /* optional spacing */
}

.left-sidebar {
    width: 250px; /* fixed width for the sidebar */
    overflow-y: auto;
    border-right: 1px solid #ccc;
    padding: 10px;
}

.pdf-container {
    flex: 1; /* fill remaining space */
    height: 100%;
}

#pdf-viewer {
    width: 100%;
    height: 100%;
    border: none;
}