body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
header {
    background-color: #343a40;
    color: white;
    padding: 15px;
    text-align: center;
    position: relative;
}
header .logout-btn {
    background-color: #dc3545;
    color: white;
    border: none;
    padding: 10px 15px;
    cursor: pointer;
    border-radius: 5px;
    position: absolute;
    top: 15px;
    right: 15px;
}
.container {
    display: flex;
    height: calc(100vh - 100px);
}
.sidebar {
    width: 20%;
    background-color: #f8f9fa;
    padding: 15px;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
    overflow-y: auto;
}
.sidebar a {
    display: block;
    color: #343a40;
    text-decoration: none;
    padding: 10px;
    margin-bottom: 5px;
    border-radius: 5px;
}
.sidebar a:hover {
    background-color: #007bff;
    color: white;
}
.content {
    flex: 1;
    padding: 15px;
}
iframe {
    width: 100%;
    height: 100%;
    border: none;
}
h1, h2 {
    margin-top: 0;
}