#11768D

CSS

:root {
  --celestial: #11768d;
  --celestial-rgb: 17 118 141;
  --celestial-oklch: oklch(0.524 0.09 218.6);
}

.element {
  color: var(--celestial);
  background-color: hsl(191 78% 31%);
  border-color: oklch(0.524 0.09 218.6);
}

Tailwind CSS v4

@theme {
  --color-celestial: #11768d;
  --color-celestial-50: #dafcff;
  --color-celestial-100: #c8f0fd;
  --color-celestial-200: #aadeef;
  --color-celestial-300: #82c3d8;
  --color-celestial-400: #5aabc2;
  --color-celestial-500: #2b94ae;
  --color-celestial-600: #277d93;
  --color-celestial-700: #1f6476;
  --color-celestial-800: #134a57;
  --color-celestial-900: #0d333c;
  --color-celestial-950: #011f26;
}

SCSS

$celestial: #11768d;
$celestial-rgb: 17, 118, 141;
$celestial-light: mix(#fff, $celestial, 20%);
$celestial-dark: mix(#000, $celestial, 20%);

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