body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4; 
            color: #333;
            margin: 0;
            padding: 20px;
        }
 
        header {
            text-align: center;
            margin-bottom: 30px;
            padding: 10px;
            background-color: #fff;
            border-bottom: 2px solid #ccc;
        }
 
        
        .container {
            display: flex;
            flex-wrap: wrap;
            gap: 20px; 
            justify-content: center;
            max-width: 900px;
            margin: 0 auto;
        }
 
        .card {
            background-color: #fff;
            border: 1px solid #ddd;
            border-radius: 6px;
            padding: 15px;
            /* Postavljamo širinu da kartice idu dvije u red */
            width: calc(50% - 30px);
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }
 
        .card h2 {
            font-size: 1.2em;
            color: #007bff; /* Plavi naslov */
            border-bottom: 1px solid #eee;
            padding-bottom: 5px;
            margin-top: 0;
        }
 
        .result-box {
            background-color: #e9ecef;
            padding: 10px;
            margin-top: 10px;
            border-radius: 4px;
            font-family: 'Courier New', monospace;
            font-size: 1.1em;
            color: #28a745; /* Zeleni tekst za rezultate */
            white-space: pre-wrap;
        }
        
        .description p {
            color: #555;
            font-size: 0.9em;
        }
 
        footer {
            text-align: center;
            margin-top: 40px;
            padding-top: 10px;
            border-top: 1px solid #ccc;
            color: #777;
            font-size: 0.8em;
        }