#667A78

CSS

:root {
  --blue-blood: #667a78;
  --blue-blood-rgb: 102 122 120;
  --blue-blood-oklch: oklch(0.563 0.024 189.1);
}

.element {
  color: var(--blue-blood);
  background-color: hsl(174 9% 44%);
  border-color: oklch(0.563 0.024 189.1);
}

Tailwind CSS v4

@theme {
  --color-blue-blood: #667a78;
  --color-blue-blood-50: #eef7f7;
  --color-blue-blood-100: #dfebea;
  --color-blue-blood-200: #c9d8d6;
  --color-blue-blood-300: #aabbba;
  --color-blue-blood-400: #8fa3a1;
  --color-blue-blood-500: #758c89;
  --color-blue-blood-600: #637674;
  --color-blue-blood-700: #4f5e5d;
  --color-blue-blood-800: #394544;
  --color-blue-blood-900: #27302f;
  --color-blue-blood-950: #151c1b;
}

SCSS

$blue-blood: #667a78;
$blue-blood-rgb: 102, 122, 120;
$blue-blood-light: mix(#fff, $blue-blood, 20%);
$blue-blood-dark: mix(#000, $blue-blood, 20%);

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