#037693

CSS

:root {
  --celestial: #037693;
  --celestial-rgb: 3 118 147;
  --celestial-oklch: oklch(0.525 0.097 222.9);
}

.element {
  color: var(--celestial);
  background-color: hsl(192 96% 29%);
  border-color: oklch(0.525 0.097 222.9);
}

Tailwind CSS v4

@theme {
  --color-celestial: #037693;
  --color-celestial-50: #d9fcff;
  --color-celestial-100: #c6f0ff;
  --color-celestial-200: #a8def4;
  --color-celestial-300: #7fc2dd;
  --color-celestial-400: #56abc8;
  --color-celestial-500: #2294b5;
  --color-celestial-600: #217d99;
  --color-celestial-700: #1b647a;
  --color-celestial-800: #0f4a5a;
  --color-celestial-900: #0a333f;
  --color-celestial-950: #001f28;
}

SCSS

$celestial: #037693;
$celestial-rgb: 3, 118, 147;
$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);
}