/* roulang page: index */
body {
            font-family: sans-serif;
            margin: 0;
            padding: 0;
            background-color: #f4f4f4;
            color: #333;
        }
        header {
            background-color: #333;
            color: #fff;
            padding: 1em 0;
            text-align: center;
        }
        nav {
            background-color: #eee;
            padding: 0.5em 0;
            text-align: center;
        }
        nav a {
            padding: 0.5em 1em;
            text-decoration: none;
            color: #333;
        }
        main {
            padding: 2em;
        }
        section {
            margin-bottom: 2em;
            background-color: #fff;
            padding: 1.5em;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        }
        h2 {
            margin-top: 0;
            color: #333;
        }
        p {
            line-height: 1.6;
        }
        footer {
            background-color: #333;
            color: #fff;
            text-align: center;
            padding: 1em 0;
            position: fixed;
            bottom: 0;
            width: 100%;
        }