body {
            font-family: 'Arial', sans-serif;
            margin: 20px;
            font-size: 18px;
            background-color: #f0f8ff; /* Light background */
            color: #333; /* Dark text color */
        }

        h1 {
            font-size: 36px;
            text-align: center;
            margin-bottom: 20px;
            color: #333;
        }

        form {
            background: #fff;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            margin-bottom: 20px;
        }

        form label {
            font-size: 18px;
            display: inline-block;
            margin-right: 10px;
            color: #333;
        }

        form input[type="checkbox"], form input[type="number"], form input[type="text"] {
            font-size: 18px;
            padding: 10px;
            border: 1px solid #ccc;
            border-radius: 4px;
            margin-bottom: 10px;
            width: auto;
            box-sizing: border-box;
        }

        button {
            font-size: 18px;
            padding: 10px 20px;
            background-color: #4CAF50;
            border: none;
            border-radius: 4px;
            color: white;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }

        button:hover {
            background-color: #45a049;
        }

        .math-problems {
            margin-top: 20px;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 20px;
        }

        .problem {
            background: #fff;
            padding: 20px;
            border: 1px solid #ccc;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            position: relative;
            font-size: 20px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .problem:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
        }

        .problem div {
            text-align: right;
            position: relative;
        }

        .problem div.operator {
            position: absolute;
            left: 50%;
            transform: translateX(-50%) translateY(-50%);
            top: 50%;
            font-weight: bold;
            font-size: 24px;
        }

        .problem div.line {
            border-top: 1px solid black;
            width: 100%;
            text-align: right;
        }

        .correct, .incorrect {
            display: block;
            margin-top: 15px; /* Added some margin to make it lower */
            font-size: 16px;
        }

        .correct {
            color: green;
        }

        .incorrect {
            color: red;
        }

        #score-container {
            font-size: 20px;
            font-weight: bold;
            text-align: center;
            margin-top: 20px;
        }