#004B90

CSS

:root {
  --olympian-blue: #004b90;
  --olympian-blue-rgb: 0 75 144;
  --olympian-blue-oklch: oklch(0.415 0.131 253.7);
}

.element {
  color: var(--olympian-blue);
  background-color: hsl(209 100% 28%);
  border-color: oklch(0.415 0.131 253.7);
}

Tailwind CSS v4

@theme {
  --color-olympian-blue: #004b90;
  --color-olympian-blue-50: #ddf8ff;
  --color-olympian-blue-100: #ccebff;
  --color-olympian-blue-200: #b0d7ff;
  --color-olympian-blue-300: #8abafa;
  --color-olympian-blue-400: #65a2ea;
  --color-olympian-blue-500: #4088da;
  --color-olympian-blue-600: #3873b8;
  --color-olympian-blue-700: #2c5c94;
  --color-olympian-blue-800: #1b446e;
  --color-olympian-blue-900: #122f4d;
  --color-olympian-blue-950: #041b33;
}

SCSS

$olympian-blue: #004b90;
$olympian-blue-rgb: 0, 75, 144;
$olympian-blue-light: mix(#fff, $olympian-blue, 20%);
$olympian-blue-dark: mix(#000, $olympian-blue, 20%);

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