#A6988F

CSS

:root {
  --earl-grey: #a6988f;
  --earl-grey-rgb: 166 152 143;
  --earl-grey-oklch: oklch(0.689 0.021 55);
}

.element {
  color: var(--earl-grey);
  background-color: hsl(23 11% 61%);
  border-color: oklch(0.689 0.021 55);
}

Tailwind CSS v4

@theme {
  --color-earl-grey: #a6988f;
  --color-earl-grey-50: #faf4ef;
  --color-earl-grey-100: #eee6e1;
  --color-earl-grey-200: #dcd2cc;
  --color-earl-grey-300: #c0b5ad;
  --color-earl-grey-400: #a99b93;
  --color-earl-grey-500: #928379;
  --color-earl-grey-600: #7b6f67;
  --color-earl-grey-700: #635952;
  --color-earl-grey-800: #49413c;
  --color-earl-grey-900: #322c29;
  --color-earl-grey-950: #1e1a17;
}

SCSS

$earl-grey: #a6988f;
$earl-grey-rgb: 166, 152, 143;
$earl-grey-light: mix(#fff, $earl-grey, 20%);
$earl-grey-dark: mix(#000, $earl-grey, 20%);

.element {
  color: $earl-grey;
  box-shadow: 0 0 0 2px rgba($earl-grey, 0.35);
}