Minor CSS fix for playground output terminal with scrollbar

[skdarekar]

Description

The playground output terminal scrollbar is always being displayed.

Domain

UI/UX

Type of Contribution

Enhancement

Code of Conduct

• [X] I follow Contributing Guidelines & Code of conduct of bhai-lang.

[skdarekar]

Created PR for this, @ristri @aniketsingh0104 please assign this to me and have a look at my change #259