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I will build a beautiful responsive website using HTML CSS and javascript
Haritha
About this gig
⭐ Are you looking for a clean, fast, professional website built with pure HTML, CSS and JavaScript?
I'm a self-taught web developer who built CosmosCalc (cosmoscalc.com) from scratch a full science tool site with 17 calculators, live API integrations, a science blog, and mobile-friendly design all in pure HTML and CSS, no heavy frameworks.
What I can build for you: Landing pages and business websites Portfolio sites Science, math or custom calculators Multi-page websites with navigation Mobile responsive design (works on all screen sizes) Clean modern dark or light themes Contact sections Google Analytics setup SEO-friendly structure (proper titles, meta descriptions)
Why choose me: I write clean, lightweight code your site will load fast Fully mobile responsive on every project Clear communication throughout Revisions until you're happy
My work: You can see a live example of my work at cosmoscalc.com a complete multi-page website I designed and built entirely myself.
Message me before ordering and tell me what you need I'll let you know honestly if I can deliver it.
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Haritha
Haritha
science webtools
- FromSri Lanka
- Member sinceMar 2026
Languages
Sinhala, English
I'm a self-taught web developer passionate about science and clean design. I build fast, mobile-friendly websites using pure HTML, CSS and JavaScript — no heavy frameworks, no bloat.
My work includes CosmosCalc (cosmoscalc.com) — a full science tool site with live API integrations, 17 calculators, and a science blog — built entirely from scratch.
I specialize in static websites, landing pages, and custom calculators. Clean code, fast delivery, and honest communication.
FAQ
Do I need to provide anything?
Just tell me what your site is about, any colours or style preferences, and the text/content you want included. I handle everything else.
Will the website work on mobile?
Yes, every website I build is fully mobile responsive and tested on multiple screen sizes.
Do you use WordPress or page builders?
No, I write clean pure HTML, CSS and JavaScript by hand. This means faster loading, no monthly fees, and no platform lock in.
Can you host the website for me?
I can guide you to host for free on Cloudflare Pages, GitHub Pages or Netlify. Hosting setup guidance is included for free.
