body {
    font-family: Arial, sans-serif;
    margin: 0;
    background-color: #f2f2f2;
}

.container {
    display: flex;
    border: 2px solid #999;
}

/* Sidebar */
.sidebar {
    width: 80px;
    background-color: #cde;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px;
}

.sidebar div {
    width: 60px;
    height: 40px;
    background-color: #9cc;
    margin: 5px 0;
    text-align: center;
    line-height: 40px;
    border: 1px solid #666;
}

/* Nội dung */
.content {
    flex: 1;
    background-color: #fdf6e3;
    padding: 20px;
    border-left: 2px solid #999;
    border-right: 2px solid #999;
}

h1 {
    text-align: center;
}

h2 {
    margin-top: 20px;
}

/* Footer */
.footer {
    text-align: center;
    padding: 10px;
    border-top: 2px solid #999;
    background-color: #ddd;
}