#5F6F6F

CSS

:root {
  --wrapped-in-twilight: #5f6f6f;
  --wrapped-in-twilight-rgb: 95 111 111;
  --wrapped-in-twilight-oklch: oklch(0.528 0.019 196.6);
}

.element {
  color: var(--wrapped-in-twilight);
  background-color: hsl(180 8% 40%);
  border-color: oklch(0.528 0.019 196.6);
}

Tailwind CSS v4

@theme {
  --color-wrapped-in-twilight: #5f6f6f;
  --color-wrapped-in-twilight-50: #eff7f7;
  --color-wrapped-in-twilight-100: #e1eaea;
  --color-wrapped-in-twilight-200: #cbd7d7;
  --color-wrapped-in-twilight-300: #adbbbb;
  --color-wrapped-in-twilight-400: #92a2a2;
  --color-wrapped-in-twilight-500: #788a8a;
  --color-wrapped-in-twilight-600: #667575;
  --color-wrapped-in-twilight-700: #515e5e;
  --color-wrapped-in-twilight-800: #3b4544;
  --color-wrapped-in-twilight-900: #282f2f;
  --color-wrapped-in-twilight-950: #161c1c;
}

SCSS

$wrapped-in-twilight: #5f6f6f;
$wrapped-in-twilight-rgb: 95, 111, 111;
$wrapped-in-twilight-light: mix(#fff, $wrapped-in-twilight, 20%);
$wrapped-in-twilight-dark: mix(#000, $wrapped-in-twilight, 20%);

.element {
  color: $wrapped-in-twilight;
  box-shadow: 0 0 0 2px rgba($wrapped-in-twilight, 0.35);
}