.container {
            max-width: 600px;
            margin: 0 auto;
            background-color: #819067;
            padding: 1.5em;
            border-radius: 8px;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }
        button {
            padding: 0.7em 1.2em;
            background-color: #0A400C;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 1em;
            margin-top: 0.7em;
        }
        button:hover, button:focus {
            background-color: #819067;
            color: #0A400C;
            outline: 2px solid #0A400C;
        }
        #results {
            margin-top: 20px;
            padding: 15px;
            border: 1px solid #eee;
            border-radius: 4px;
            background-color: #f9f9f9;
        }
        #error-message {
            color: red;
            font-weight: bold;
            margin-top: 10px;
        }
        .loading {
            font-style: italic;
            color: #777;
        }