#2B748F

CSS

:root {
  --blue-fjord: #2b748f;
  --blue-fjord-rgb: 43 116 143;
  --blue-fjord-oklch: oklch(0.526 0.082 226.3);
}

.element {
  color: var(--blue-fjord);
  background-color: hsl(196 54% 36%);
  border-color: oklch(0.526 0.082 226.3);
}

Tailwind CSS v4

@theme {
  --color-blue-fjord: #2b748f;
  --color-blue-fjord-50: #defaff;
  --color-blue-fjord-100: #cceefe;
  --color-blue-fjord-200: #b0dcf0;
  --color-blue-fjord-300: #8bc0d9;
  --color-blue-fjord-400: #66a9c4;
  --color-blue-fjord-500: #4091b0;
  --color-blue-fjord-600: #387b95;
  --color-blue-fjord-700: #2d6277;
  --color-blue-fjord-800: #1e4858;
  --color-blue-fjord-900: #14323d;
  --color-blue-fjord-950: #051e27;
}

SCSS

$blue-fjord: #2b748f;
$blue-fjord-rgb: 43, 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);
}