Blue Spruce

CSS

:root {
  --blue-spruce: #adc5c9;
  --blue-spruce-rgb: 173 197 201;
  --blue-spruce-oklch: oklch(0.807 0.027 208.7);
}

.element {
  color: var(--blue-spruce);
  background-color: hsl(189 21% 73%);
  border-color: oklch(0.807 0.027 208.7);
}

Tailwind CSS v4

@theme {
  --color-blue-spruce: #adc5c9;
  --color-blue-spruce-50: #edf7f9;
  --color-blue-spruce-100: #deeaed;
  --color-blue-spruce-200: #c8d8db;
  --color-blue-spruce-300: #a9bbbf;
  --color-blue-spruce-400: #8da3a7;
  --color-blue-spruce-500: #728b90;
  --color-blue-spruce-600: #617679;
  --color-blue-spruce-700: #4d5e61;
  --color-blue-spruce-800: #384547;
  --color-blue-spruce-900: #263031;
  --color-blue-spruce-950: #151c1d;
}

SCSS

$blue-spruce: #adc5c9;
$blue-spruce-rgb: 173, 197, 201;
$blue-spruce-light: mix(#fff, $blue-spruce, 20%);
$blue-spruce-dark: mix(#000, $blue-spruce, 20%);

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