#257491

CSS

:root {
  --blue-fjord: #257491;
  --blue-fjord-rgb: 37 116 145;
  --blue-fjord-oklch: oklch(0.525 0.087 226.8);
}

.element {
  color: var(--blue-fjord);
  background-color: hsl(196 59% 36%);
  border-color: oklch(0.525 0.087 226.8);
}

Tailwind CSS v4

@theme {
  --color-blue-fjord: #257491;
  --color-blue-fjord-50: #ddfbff;
  --color-blue-fjord-100: #cbeeff;
  --color-blue-fjord-200: #aedcf2;
  --color-blue-fjord-300: #88c1db;
  --color-blue-fjord-400: #63a9c6;
  --color-blue-fjord-500: #3b92b3;
  --color-blue-fjord-600: #347b97;
  --color-blue-fjord-700: #296379;
  --color-blue-fjord-800: #1b4959;
  --color-blue-fjord-900: #12323e;
  --color-blue-fjord-950: #041e27;
}

SCSS

$blue-fjord: #257491;
$blue-fjord-rgb: 37, 116, 145;
$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);
}