body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

h1 {
    text-align: center;
    color: #2c3e50;
}

#sidebar {
    position: fixed;
    width: 140px;
    height: 100%;
    background-color: #f4f4f4;
    transition: left 0.3s;
}

#toggle-line {
    cursor: pointer;
    padding: 10px;
    background-color: #ccc;
    text-align: center;
}