Prompt

Make a place to write one good thing that happened, once a day. 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.

One line at a time. Today's box is open when the page loads, with the date above it. Writing saves as I type — no save button.

Underneath, show the past entries newest first, with their dates. Keep them quiet and plain; this is for reading back, not for decoration.

Add a button that shows one random past entry. That is the reason to keep it.

Only one entry per day. If I come back later the same day, let me edit what is there rather than adding a second.

Everything stays in my browser and goes nowhere else.

When you are done, check that writing twice in one day edits rather than adds.