• Lightest Gray
  hex: #f7f7f9
  scss variable: $color-neutral-lightest-gray
• Cool Gray
  hex: #e2e2e2
  scss variable: $color-neutral-cool-gray
• Medium Cool Gray
  hex: #b1b3b3
  scss variable: $color-neutral-medium-cool-gray
• Dark Cool Gray
  hex: #53565a
  scss variable: $color-neutral-dark-cool-gray

To add to these items, use Sass variables that start with $color-neutral- in ./source/css/scss/abstracts/_variables.scss