Practice Final
It uses a D3 visualization called hexmap. Here is the code for it:
hexes.html, hexes.css, hexes.js, hexUSA.json
Put all this in your static server, and it should work.

Also, here is the gradient example from the review lecture; use it to learn the colors and understand gradients. Enter colors as triples of decimal numbers, for example bright yellow would be "255,255,0".
gradient.html, gradient.css, gradient.js