#004C61

CSS

:root {
  --raging-thunderstorm: #004c61;
  --raging-thunderstorm-rgb: 0 76 97;
  --raging-thunderstorm-oklch: oklch(0.387 0.073 224.2);
}

.element {
  color: var(--raging-thunderstorm);
  background-color: hsl(193 100% 19%);
  border-color: oklch(0.387 0.073 224.2);
}

Tailwind CSS v4

@theme {
  --color-raging-thunderstorm: #004c61;
  --color-raging-thunderstorm-50: #e0faff;
  --color-raging-thunderstorm-100: #cfeefb;
  --color-raging-thunderstorm-200: #b4dbec;
  --color-raging-thunderstorm-300: #90c0d4;
  --color-raging-thunderstorm-400: #6da8bf;
  --color-raging-thunderstorm-500: #4b91aa;
  --color-raging-thunderstorm-600: #407a90;
  --color-raging-thunderstorm-700: #336273;
  --color-raging-thunderstorm-800: #234855;
  --color-raging-thunderstorm-900: #17323b;
  --color-raging-thunderstorm-950: #081e25;
}

SCSS

$raging-thunderstorm: #004c61;
$raging-thunderstorm-rgb: 0, 76, 97;
$raging-thunderstorm-light: mix(#fff, $raging-thunderstorm, 20%);
$raging-thunderstorm-dark: mix(#000, $raging-thunderstorm, 20%);

.element {
  color: $raging-thunderstorm;
  box-shadow: 0 0 0 2px rgba($raging-thunderstorm, 0.35);
}