The website is a single static page at ./code/index.html, built with plain HTML and CSS — no framework and no build step.

The page shows exactly three balls (solid circles) arranged in one horizontal row, left to right, evenly spaced and centered on the page.

All three balls are blue.

Change the rightmost ball to red. The left and middle balls stay blue.

Swap the rightmost ball with the leftmost ball: exchange their positions so the ball that was on the right is now on the left, and the ball that was on the left is now on the right. Their colors move with them.

Make the rightmost ball green.