Site Responsiveness & Design Alignment

I need an expert to make my site fully responsive across mobile, tablet, and desktop. Furthermore, I want the color scheme and fonts to match those of https://www.calculator.net/, specifically utilizing the primary color throughout.

Ideal Skills:
- Web development with a focus on responsive design
- Proficient in CSS and HTML
- Experience with cross-device compatibility
- Strong eye for design and attention to detail
- Knowledge of color theory and typography

the budget is 1000 inr for the job
as max work is already done