changed the background color of scroll to top button

[sumitkr2000]

🛠️ Fixes Issue: #178

👨‍💻 Changes proposed:

Hey @Fenrir-04 I have changed the background color of scroll to top button matching the theme of the website. Please review my pr and merge it. Thank you!

📝 Additional Notes

Discord username

sumitkr2000

Link to any external resources

📷 Screenshots

✔️ Check List (Check all the applicable boxes)

• [x] My code follows the code style of this project.
• [x] The title of my pull request is a short description of the requested changes.
• [x] I am a participant of GSSOC23

[Fenrir-04]

hey @sumitkr2000, nice work!