Prompt

Make a tip calculator. Make it a single HTML file that opens in a browser with nothing to install and no other files. Put the CSS and JavaScript inside it. Do not use image files or any external address; use emoji or letters if you need a symbol.

I type the bill in dollars. Show the tip at 15% with buttons to change it quickly, and a slider for anything in between.

Show three numbers big and clear: the tip, the total, and the amount each person owes. Let me set how many people are splitting it.

Round each person's share up to a sensible amount and show the leftover, so the group does not end up a coin short.

When you are done, check the split with an awkward number of people and confirm the shares add up to at least the total.