#667A7B

CSS

:root {
  --blue-blood: #667a7b;
  --blue-blood-rgb: 102 122 123;
  --blue-blood-oklch: oklch(0.564 0.024 200.2);
}

.element {
  color: var(--blue-blood);
  background-color: hsl(183 9% 44%);
  border-color: oklch(0.564 0.024 200.2);
}

Tailwind CSS v4

@theme {
  --color-blue-blood: #667a7b;
  --color-blue-blood-50: #eef7f8;
  --color-blue-blood-100: #dfeaeb;
  --color-blue-blood-200: #c9d7d8;
  --color-blue-blood-300: #aabbbc;
  --color-blue-blood-400: #8fa3a4;
  --color-blue-blood-500: #758b8c;
  --color-blue-blood-600: #637677;
  --color-blue-blood-700: #4f5e5f;
  --color-blue-blood-800: #394545;
  --color-blue-blood-900: #273030;
  --color-blue-blood-950: #151c1c;
}

SCSS

$blue-blood: #667a7b;
$blue-blood-rgb: 102, 122, 123;
$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);
}