#28748F

CSS

:root {
  --blue-fjord: #28748f;
  --blue-fjord-rgb: 40 116 143;
  --blue-fjord-oklch: oklch(0.525 0.084 225.6);
}

.element {
  color: var(--blue-fjord);
  background-color: hsl(196 56% 36%);
  border-color: oklch(0.525 0.084 225.6);
}

Tailwind CSS v4

@theme {
  --color-blue-fjord: #28748f;
  --color-blue-fjord-50: #ddfbff;
  --color-blue-fjord-100: #cceefe;
  --color-blue-fjord-200: #afdcf1;
  --color-blue-fjord-300: #89c1d9;
  --color-blue-fjord-400: #65a9c4;
  --color-blue-fjord-500: #3e92b0;
  --color-blue-fjord-600: #367b95;
  --color-blue-fjord-700: #2b6377;
  --color-blue-fjord-800: #1c4958;
  --color-blue-fjord-900: #13323d;
  --color-blue-fjord-950: #041e27;
}

SCSS

$blue-fjord: #28748f;
$blue-fjord-rgb: 40, 116, 143;
$blue-fjord-light: mix(#fff, $blue-fjord, 20%);
$blue-fjord-dark: mix(#000, $blue-fjord, 20%);

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