#127690

CSS

:root {
  --celestial: #127690;
  --celestial-rgb: 18 118 144;
  --celestial-oklch: oklch(0.525 0.092 221.3);
}

.element {
  color: var(--celestial);
  background-color: hsl(192 78% 32%);
  border-color: oklch(0.525 0.092 221.3);
}

Tailwind CSS v4

@theme {
  --color-celestial: #127690;
  --color-celestial-50: #dafcff;
  --color-celestial-100: #c8efff;
  --color-celestial-200: #aadef1;
  --color-celestial-300: #82c2da;
  --color-celestial-400: #5aabc5;
  --color-celestial-500: #2b94b1;
  --color-celestial-600: #277d96;
  --color-celestial-700: #1f6478;
  --color-celestial-800: #134a58;
  --color-celestial-900: #0c333e;
  --color-celestial-950: #011f27;
}

SCSS

$celestial: #127690;
$celestial-rgb: 18, 118, 144;
$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);
}