#177590

CSS

:root {
  --celestial: #177590;
  --celestial-rgb: 23 117 144;
  --celestial-oklch: oklch(0.524 0.091 222.9);
}

.element {
  color: var(--celestial);
  background-color: hsl(193 72% 33%);
  border-color: oklch(0.524 0.091 222.9);
}

Tailwind CSS v4

@theme {
  --color-celestial: #177590;
  --color-celestial-50: #dbfbff;
  --color-celestial-100: #c9efff;
  --color-celestial-200: #abddf2;
  --color-celestial-300: #83c2db;
  --color-celestial-400: #5caac6;
  --color-celestial-500: #2f93b2;
  --color-celestial-600: #2b7c96;
  --color-celestial-700: #226478;
  --color-celestial-800: #154958;
  --color-celestial-900: #0e333e;
  --color-celestial-950: #011e27;
}

SCSS

$celestial: #177590;
$celestial-rgb: 23, 117, 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);
}