body {
            font-family: Arial, sans-serif;
            margin: 20px;
            background-color: #f4f4f9;
        }
        .container {
            max-width: 600px;
            margin: auto;
            background: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }
        h1 {
            color: #333;
            border-bottom: 2px solid #ccc;
            padding-bottom: 10px;
            text-align: center;
        }
        label {
            display: block;
            margin-top: 10px;
            font-weight: bold;
        }
        input[type="number"] {
            width: calc(100% - 12px);
            padding: 8px;
            margin-top: 4px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        button {
            display: block;
            width: 100%;
            padding: 10px;
            margin-top: 20px;
            background-color: #007bff;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
        }
        button:hover {
            background-color: #0056b3;
        }
        .resultat {
            margin-top: 20px;
            padding: 15px;
            border: 2px solid #28a745;
            border-radius: 4px;
            background-color: #e2ffe8;
            font-size: 1.2em;
            text-align: center;
        }
        .note {
            font-size: 0.8em;
            color: #666;
            margin-top: 5px;
        }