Modern Responsive Website Development

I need a modern, mobile-first login page built with pure HTML, CSS and vanilla JavaScript. The overall aesthetic should be unmistakably colorful, featuring a rich purple-and-black palette that feels polished on phones, tablets and larger screens alike... (Budget: ₹12500 - ₹37500 INR, Jobs: Animation, CSS, Frontend Development, HTML, JavaScript, Mobile App Development, Web Development, Website Design)