Project: color
Task (challenging): - default `.lch-wheel .wheel` angle (h) is 0
- add a lightness vertical range (class `l`) in the `.lch-wheel`
  - default value is 50
  - change lightness range to redraw `.lch-wheel .wheel` with new lightness, and update `.lch-wheel` background color
- add a chroma vertical range (class `c`) in the `.lch-wheel`
  - default value is 50
  - change chroma range to update `.lch-wheel` background color