fix : Responsive Testimonial Cards

[Anamika-garg]

Title : fix Responsive Issues with Testimonial Cards

Issue No. : #1398

Code Stack : HTML , CSS

Description

Added flex settings to testimonials div to make it responsive

Video/Screenshots (mandatory)

The Updated one

The previous one was

Type of PR

• [✅ ] Bug fix

Checklist:

• [X] I have performed a self-review of my code.
• [X] I have commented my code, particularly in hard-to-understand areas.
• [X] I have tested the changes thoroughly before submitting this pull request.
• [X] I have provided relevant issue numbers, screenshots, and videos after making the changes.
• [X] I have gone through the contributing.md file before contributing

Additional context:

Are you contributing under any Open-source programme?

• [X] I am contributing under GSSOC'24
• [] I am contributing under VSOC'24

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