changes at syle.css

[venomp]

PR Description 📜

snake game was working properly but the issue was with the css file where closing bracket was missing

Fixes #3118

---

Mark the task you have completed ✅

---

Add your screenshots(Optional) 📸

---

Thank you soo much for contributing to our repository 💗

[kunjgit]

Thank you @venomp ,for creating the PR and contributing to our GameZone 💗
Review team will review the PR and will reach out to you soon! 😇
Make sure that you have marked all the tasks that you are done with ✅.
Thank you for your patience! 😀

[kunjgit]

Thank you @venomp , for your valuable time and contribution in our GameZone 💗.
It’s our GameZone, so Let’s build this GameZone altogether !!🤝
Hoping to see you soon with another PR again 😇
Wishing you all the best for your journey into Open Source🚀