<style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f7fa;
            color: #333;
            padding: 20px;
        }

        .container {
            max-width: 1000px;
            margin: 0 auto;
        }

        h1 {
            font-size: 2em;
            color: #2c3e50;
            margin-bottom: 10px;
        }

        .nav {
            margin-bottom: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .nav a {
            text-decoration: none;
            color: #fff;
            background-color: #38ada9;
            padding: 8px 14px;
            border-radius: 5px;
            font-size: 0.95em;
        }

        .content {
            background-color: #ffffff;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

        /* Styles for 3-column section */
        .three-columns {
            display: flex;
            gap: 20px;
            margin-top: 20px;
        }

        .column {
            flex: 1;
            background-color: #fff;
            padding: 15px;
            border-radius: 6px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);
        }

        .column h2 {
            font-size: 1.1em;
            color: #2c3e50;
            margin-bottom: 10px;
        }

        .column p {
            font-size: 0.95em;
        }
    </style>