Added consistent newsletter color across all pages

[swathivemula7]

🛠️ Fixes Issue

Fixes: #3085

👨‍💻 Description

I have made the color of the newsletter consistent across all pages...Adjusted the color in four pages(blog,courses,tools, and quiz page) to make it consistent..

📄 Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (adds or updates related documentation)

📷 Screenshots/GIFs (if any)

✅ Checklist

• I am a participant of GSSoC-ext.
• I have followed the contribution guidelines of this project.
• I have made this change from my own.
• I have taken help from some online resources.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have added documentation to explain my changes.

Mandatory Tasks

• Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.

🤝 GSSoC Participation

• This PR is submitted under the GSSoC program.
• I have taken prior approval for this feature/fix.
  @deepeshmlgupta kindly review the PR

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