#5A7070

CSS

:root {
  --wrapped-in-twilight: #5a7070;
  --wrapped-in-twilight-rgb: 90 112 112;
  --wrapped-in-twilight-oklch: oklch(0.527 0.026 196.4);
}

.element {
  color: var(--wrapped-in-twilight);
  background-color: hsl(180 11% 40%);
  border-color: oklch(0.527 0.026 196.4);
}

Tailwind CSS v4

@theme {
  --color-wrapped-in-twilight: #5a7070;
  --color-wrapped-in-twilight-50: #edf8f8;
  --color-wrapped-in-twilight-100: #deebeb;
  --color-wrapped-in-twilight-200: #c8d8d8;
  --color-wrapped-in-twilight-300: #a9bcbc;
  --color-wrapped-in-twilight-400: #8da3a3;
  --color-wrapped-in-twilight-500: #738c8c;
  --color-wrapped-in-twilight-600: #617676;
  --color-wrapped-in-twilight-700: #4e5f5f;
  --color-wrapped-in-twilight-800: #384545;
  --color-wrapped-in-twilight-900: #263030;
  --color-wrapped-in-twilight-950: #151c1c;
}

SCSS

$wrapped-in-twilight: #5a7070;
$wrapped-in-twilight-rgb: 90, 112, 112;
$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);
}