#5A7074

CSS

:root {
  --wrapped-in-twilight: #5a7074;
  --wrapped-in-twilight-rgb: 90 112 116;
  --wrapped-in-twilight-oklch: oklch(0.529 0.027 209.9);
}

.element {
  color: var(--wrapped-in-twilight);
  background-color: hsl(189 13% 40%);
  border-color: oklch(0.529 0.027 209.9);
}

Tailwind CSS v4

@theme {
  --color-wrapped-in-twilight: #5a7074;
  --color-wrapped-in-twilight-50: #edf7fa;
  --color-wrapped-in-twilight-100: #deeaed;
  --color-wrapped-in-twilight-200: #c8d8db;
  --color-wrapped-in-twilight-300: #a9bbbf;
  --color-wrapped-in-twilight-400: #8da3a7;
  --color-wrapped-in-twilight-500: #728b90;
  --color-wrapped-in-twilight-600: #61767a;
  --color-wrapped-in-twilight-700: #4d5e61;
  --color-wrapped-in-twilight-800: #384547;
  --color-wrapped-in-twilight-900: #263031;
  --color-wrapped-in-twilight-950: #151c1d;
}

SCSS

$wrapped-in-twilight: #5a7074;
$wrapped-in-twilight-rgb: 90, 112, 116;
$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);
}