body {
            display: flex;
            align-items: center;
            justify-content: center;
            height: 100vh;
            margin: 0;
            background-color: #f0f0f0;
            font-family: 'Arial', sans-serif;
        }

        table {
            border-collapse: collapse;
            background-color: #fff;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            overflow: hidden;
        }

        td {
            width: 80px;
            height: 80px;
            border: 1px solid #ccc;
            text-align: center;
            font-size: 24px;
            cursor: pointer;
            transition: background-color 0.3s;
        }

        td:hover {
            background-color: #f8f8f8;
        }

        td:empty::before {
            content: "";
            display: inline-block;
            height: 0;
            vertical-align: middle;
        }

        td.X::before {
            content: "X";
            color: #3498db;
        }

        td.O::before {
            content: "O";
            color: #e74c3c;
        }

        h1 {
            text-align: center;
            color: #333;
        }