#00768E

CSS

:root {
  --celestial: #00768e;
  --celestial-rgb: 0 118 142;
  --celestial-oklch: oklch(0.523 0.094 218.5);
}

.element {
  color: var(--celestial);
  background-color: hsl(190 100% 28%);
  border-color: oklch(0.523 0.094 218.5);
}

Tailwind CSS v4

@theme {
  --color-celestial: #00768e;
  --color-celestial-50: #d9fcff;
  --color-celestial-100: #c6f0fe;
  --color-celestial-200: #a8def1;
  --color-celestial-300: #7fc3d9;
  --color-celestial-400: #56acc4;
  --color-celestial-500: #2295b0;
  --color-celestial-600: #217e95;
  --color-celestial-700: #1a6577;
  --color-celestial-800: #0f4a57;
  --color-celestial-900: #0a343d;
  --color-celestial-950: #001f27;
}

SCSS

$celestial: #00768e;
$celestial-rgb: 0, 118, 142;
$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);
}