.converter-container {
            background-color: #C4C4C4;
            padding: 10px;
            border-radius: 10px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
            width: 400px;
            height: 400px;
            text-align: center;
        }
        h2 {
            color: #333;
            margin-bottom: 15px;
        }
        .input-group {
            display: flex;
            flex-direction: column;
            margin-bottom: 15px;
            text-align: left;
        }
        label {
            font-weight: bold;
            margin-bottom: 5px;
            color: #555;
            font-size: 0.9em;
        }
        input[type="number"], select {
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 1em;
            width: 100%;
            box-sizing: border-box;
            appearance: none;
        }
        button {
            width: 100%;
            padding: 12px;
            background-color: #007bff;
            color: white;
            border: none;
            border-radius: 5px;
            font-size: 1em;
            cursor: pointer;
            transition: background-color 0.3s;
            margin-top: 15px;
        }
        button:hover {
            background-color: #0056b3;
        }
        .result {
            margin-top: 25px;
            padding: 15px;
            border: 2px solid #28a745;
            border-radius: 5px;
            background-color: #e6ffed;
            font-size: 1.2em;
            font-weight: bold;
            color: #28a745;
        }
        #unitCategory {
            margin-bottom: 20px;
        }