Improved scroll bar of various section inside home page and added smooth scroll behaviour

[gunjan-g]

Description

Fixed Issue #512 Changed scrollbar of Guess the singer, Lyrics Finder, Tabla, Drum kit, Quiz, Artist, Karaoke

Checklist

• [✔️ ] I am making a proper pull request, not a spam.
• [ ✔️] I've checked the issue list before deciding what to submit.

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