body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    display: flex;
}

.container {
    display: flex;
    width: 100%;
}

.sidebar {
    width: 225px;
    background-color: #333;
    color: white;
    padding: 15px;
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
}

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

.sidebar ul li {
    margin-bottom: 10px;
}

.sidebar ul li a {
    color: white;
    text-decoration: none;
    display: block;
    padding: 8px;
    border-radius: 4px;
    transition: background 0.3s;
}

.sidebar ul li a:hover {
    background-color: #575757;
}

.content {
    flex: 1;
    padding: 20px;
    display: flex;
    flex-direction: column;
}

header {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1em 0;
}

main {
    padding: 20px;
    flex: 1;
}

h1, h2 {
    color: #333;
}

section {
    margin-bottom: 20px;
}

iframe {
    flex: 1;
    width: 100%;
    border: none;
}