mmbarreira/bets-helper ? reverse-engineered prompt

Build me a simple betting helper website that works in the browser.

I want a clean page where someone can enter a few bet details and get helpful results right away, like quick calculations and an easy way to compare options. Keep it simple and easy to use on desktop and mobile, with a nice layout, clear buttons, and readable styling.

Make it feel like a small useful tool rather than a complicated app. If you need to guess at the best way to structure it, keep the experience straightforward and practical. Use the existing HTML and CSS files, and add any small bits of JavaScript needed so the page actually does something useful.

If you need current best practices or a small helper library, look up the latest docs online.