#687876

CSS

:root {
  --blue-blood: #687876;
  --blue-blood-rgb: 104 120 118;
  --blue-blood-oklch: oklch(0.559 0.019 187.5);
}

.element {
  color: var(--blue-blood);
  background-color: hsl(173 7% 44%);
  border-color: oklch(0.559 0.019 187.5);
}

Tailwind CSS v4

@theme {
  --color-blue-blood: #687876;
  --color-blue-blood-50: #eff7f6;
  --color-blue-blood-100: #e1eae9;
  --color-blue-blood-200: #ccd7d6;
  --color-blue-blood-300: #adbbb9;
  --color-blue-blood-400: #92a2a0;
  --color-blue-blood-500: #788b88;
  --color-blue-blood-600: #667573;
  --color-blue-blood-700: #525e5c;
  --color-blue-blood-800: #3b4543;
  --color-blue-blood-900: #292f2e;
  --color-blue-blood-950: #161c1b;
}

SCSS

$blue-blood: #687876;
$blue-blood-rgb: 104, 120, 118;
$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);
}