[Style] background colors and font colors

[callmeVAMP]

What's the style idea?

We need to improve the background colors to more moderate colors. They are way to vibrant. More responsiveness can be added. Assign me under GSSOC'24

Checklist

• [X] I have checked the existing issues.
• [X] I follow Contributing Guidelines of this project.
• [ ] I am a IWOC'24 contributor.
• [ ] I am a JWOC'24 contributor.
• [ ] I am a SWOC'24 contributor.

Code of Conduct

• [X] I agree to follow this project's "Code of Conduct".