#00788E

CSS

:root {
  --celestial: #00788e;
  --celestial-rgb: 0 120 142;
  --celestial-oklch: oklch(0.528 0.094 216.5);
}

.element {
  color: var(--celestial);
  background-color: hsl(189 100% 28%);
  border-color: oklch(0.528 0.094 216.5);
}

Tailwind CSS v4

@theme {
  --color-celestial: #00788e;
  --color-celestial-50: #d8fcff;
  --color-celestial-100: #c6f0fd;
  --color-celestial-200: #a7dfef;
  --color-celestial-300: #7ec3d8;
  --color-celestial-400: #55acc2;
  --color-celestial-500: #1f95ae;
  --color-celestial-600: #1f7e93;
  --color-celestial-700: #196576;
  --color-celestial-800: #0e4a56;
  --color-celestial-900: #09343c;
  --color-celestial-950: #001f26;
}

SCSS

$celestial: #00788e;
$celestial-rgb: 0, 120, 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);
}