body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}


.header {
    background-color: #3498db;
    color: #fff;
    text-align: center;
    padding: 20px;
}


.content {
    margin: 20px;
}


.sidebar {
    background-color: #ecf0f1;
    padding: 20px;
    width: 250px;
    float: right;
}


.sidebar a {
    text-decoration: none;
    color: #333;
}


.sidebar h3 {
    font-size: 1.2em;
    margin-bottom: 10px;
}