#004F67

CSS

:root {
  --raging-thunderstorm: #004f67;
  --raging-thunderstorm-rgb: 0 79 103;
  --raging-thunderstorm-oklch: oklch(0.399 0.077 226.7);
}

.element {
  color: var(--raging-thunderstorm);
  background-color: hsl(194 100% 20%);
  border-color: oklch(0.399 0.077 226.7);
}

Tailwind CSS v4

@theme {
  --color-raging-thunderstorm: #004f67;
  --color-raging-thunderstorm-50: #e0faff;
  --color-raging-thunderstorm-100: #cfeefd;
  --color-raging-thunderstorm-200: #b3dbef;
  --color-raging-thunderstorm-300: #8ec0d7;
  --color-raging-thunderstorm-400: #6ca8c2;
  --color-raging-thunderstorm-500: #4890ad;
  --color-raging-thunderstorm-600: #3e7a93;
  --color-raging-thunderstorm-700: #316275;
  --color-raging-thunderstorm-800: #224856;
  --color-raging-thunderstorm-900: #16323c;
  --color-raging-thunderstorm-950: #071e26;
}

SCSS

$raging-thunderstorm: #004f67;
$raging-thunderstorm-rgb: 0, 79, 103;
$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);
}