Use shades to determine accessible color contrast at a glance.
- Use to generate a numerical shade from 0 to 200 based on a color's luminance.
- Use shades when naming colors (for example, "green105").
- Two colors with a difference of 100 or more have ≥ 4.5 contrast.
- Two colors with a difference of 75 or more have ≥ 3.0 contrast.