body {
    display: flex;
    flex-direction: column;
    height: 100vh;
    margin: 0;
    font-family: sans-serif;
}

/* Top Banner */
.top-banner {
    background-color: #007bff;
    color: white;
    text-align: center;
    padding: 10px;
    position: relative;
    z-index: 1000;
    text-truncate: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    height: 100px;
}

/* Main Content Container */
.main-container {
    display: flex;
    flex-grow: 1;
}

/* Navbar */
.navbar {
    width: 200px;
    flex-shrink: 0;
    background-color: #f8f9fa;
    border-right: 1px solid #dee2e6;
    padding: 15px;
}

.navbar-brand img {
    width: 50px;
    height: 50px;
}

.navbar-nav {
    margin-top: 15px;
    padding: 0; 
    list-style: none; 
}

.nav-item {
    margin-bottom: 5px; 
}

.nav-link {
    padding: 8px 15px;
    border-radius: 5px;
    transition: background-color 0.2s;
    display: block; 
    width: 100%; 
    text-decoration: none; 
    color: #000; 
}

.nav-link:hover {
    background-color: #e9ecef;
}

/* Iframe Container */
.iframe-container {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

/* Iframe */
iframe {
    flex-grow: 1;
    border: none;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .main-container {
        flex-direction: column;
    }

    .navbar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid #dee2e6;
    }
}