#004C65

CSS

:root {
  --raging-thunderstorm: #004c65;
  --raging-thunderstorm-rgb: 0 76 101;
  --raging-thunderstorm-oklch: oklch(0.389 0.076 228.6);
}

.element {
  color: var(--raging-thunderstorm);
  background-color: hsl(195 100% 20%);
  border-color: oklch(0.389 0.076 228.6);
}

Tailwind CSS v4

@theme {
  --color-raging-thunderstorm: #004c65;
  --color-raging-thunderstorm-50: #e0faff;
  --color-raging-thunderstorm-100: #cfedfd;
  --color-raging-thunderstorm-200: #b4dbef;
  --color-raging-thunderstorm-300: #8fbfd8;
  --color-raging-thunderstorm-400: #6da8c2;
  --color-raging-thunderstorm-500: #4a90ae;
  --color-raging-thunderstorm-600: #407a93;
  --color-raging-thunderstorm-700: #336276;
  --color-raging-thunderstorm-800: #224857;
  --color-raging-thunderstorm-900: #17323d;
  --color-raging-thunderstorm-950: #081e26;
}

SCSS

$raging-thunderstorm: #004c65;
$raging-thunderstorm-rgb: 0, 76, 101;
$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);
}