    <style>
        body {
            background-color: #FFFFFF;
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
        }
        header {
            
            padding: 10px;
            text-align: center;
        }
        nav {
            background-color: #333;
            color: #fff;
            text-align: center;
            padding: 10px 0;
        }
        nav a {
            
            color: #fff;
            text-decoration: none;
            padding: 10px 20px;
        }
        nav a:hover {
            background-color: #555;
        }
        .container {
            background-color: #FFFFFF;
            width: 80%;
            margin: auto;
            padding: 20px 0;
        }
        .main-content {
            background-color: #FFFFFF;
            display: flex;
            justify-content: space-between;
        }
        .content {
            background-color: #FFFFFF;
            width: 70%;
        }
        .sidebar {
            width: 25%;
            background-color: #f0f0f0;
            padding: 20px;
        }
        footer {
            background-color: #333;
            color: #fff;
            text-align: center;
            padding: 10px 0;
            
            bottom: 0;
            width: 100%;
        }
        ol {
            margin-top: 20px;
        }
        ol li {
            margin-bottom: 10px;
        }
        table, th, td {
          border: 1px solid black;
          border-collapse: collapse;
        }
    </style>