body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            background-color: #f4f4f4;
        }
        .container {
            width: 80%;
            margin: auto;
            overflow: hidden;
        }
        header {
            background: #333;
            color: #fff;
            padding: 20px 0;
            text-align: center;
            position: relative;
        }
        nav {
            display: flex;
            justify-content: center;
            background: #444;
            padding: 10px 0;
            position: absolute;
            bottom: -40px;
            width: 100%;
            left: 0;
        }
        nav a {
            color: white;
            text-decoration: none;
            padding: 10px 20px;
            margin: 0 10px;
            background: #555;
            border-radius: 5px;
            transition: background 0.3s;
        }
        nav a:hover {
            background: #777;
        }
        section {
            background: #fff;
            padding: 20px;
            margin: 60px 0 20px 0;
            border-radius: 5px;
        }
        ul {
            list-style: none;
            padding: 0;
        }
        ul li {
            background: #ddd;
            margin: 5px 0;
            padding: 10px;
            border-radius: 3px;
        }
        form {
            display: flex;
            flex-direction: column;
        }
        input, textarea, button {
            margin: 5px 0;
            padding: 10px;
        }
        
        
 .software-list {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            justify-content: center;
        }
        .software-item {
            text-align: center;
            width: 150px;
        }
        .software-item img {
            width: 100px;
            height: 100px;
            object-fit: contain;
        }
        
        
        .realisation-item img {
            width: 33%;
            height: auto;
            border-radius: 10px;
        }
        .realisation-item {
            text-align: center;
            background: #f5f5f5;
            padding: 10px;
            border-radius: 10px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }