Improve UI Design with Gradient Background and Update Rules Section

[saumyasri123]

The current user interface of the Tic Tac Toe game has a plain background that lacks visual appeal. To enhance the overall user experience, I suggest the following improvements:

Gradient Background: Implement a gradient effect for the background to create a more vibrant and engaging atmosphere. This will add depth and make the game visually attractive.

Update Rules Section: The rules section is currently unclear and could be more informative. I propose redesigning it to include clearer instructions on how to play, along with visual aids or examples to enhance understanding.

These changes will not only improve the aesthetic quality of the game but also provide a better user experience by making the rules more accessible and visually appealing. I would be happy to contribute to these updates if needed!