#005D76

CSS

:root {
  --blue-collar: #005d76;
  --blue-collar-rgb: 0 93 118;
  --blue-collar-oklch: oklch(0.445 0.084 224.2);
}

.element {
  color: var(--blue-collar);
  background-color: hsl(193 100% 23%);
  border-color: oklch(0.445 0.084 224.2);
}

Tailwind CSS v4

@theme {
  --color-blue-collar: #005d76;
  --color-blue-collar-50: #ddfbff;
  --color-blue-collar-100: #cceefe;
  --color-blue-collar-200: #afdcf0;
  --color-blue-collar-300: #89c1d8;
  --color-blue-collar-400: #64a9c3;
  --color-blue-collar-500: #3d92af;
  --color-blue-collar-600: #357b94;
  --color-blue-collar-700: #2a6377;
  --color-blue-collar-800: #1c4957;
  --color-blue-collar-900: #12323d;
  --color-blue-collar-950: #041e26;
}

SCSS

$blue-collar: #005d76;
$blue-collar-rgb: 0, 93, 118;
$blue-collar-light: mix(#fff, $blue-collar, 20%);
$blue-collar-dark: mix(#000, $blue-collar, 20%);

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