#004B5F

CSS

:root {
  --raging-thunderstorm: #004b5f;
  --raging-thunderstorm-rgb: 0 75 95;
  --raging-thunderstorm-oklch: oklch(0.383 0.072 223.3);
}

.element {
  color: var(--raging-thunderstorm);
  background-color: hsl(193 100% 19%);
  border-color: oklch(0.383 0.072 223.3);
}

Tailwind CSS v4

@theme {
  --color-raging-thunderstorm: #004b5f;
  --color-raging-thunderstorm-50: #e1faff;
  --color-raging-thunderstorm-100: #d0eefa;
  --color-raging-thunderstorm-200: #b5dbec;
  --color-raging-thunderstorm-300: #90c0d3;
  --color-raging-thunderstorm-400: #6ea8be;
  --color-raging-thunderstorm-500: #4b91a9;
  --color-raging-thunderstorm-600: #417a8f;
  --color-raging-thunderstorm-700: #346272;
  --color-raging-thunderstorm-800: #234854;
  --color-raging-thunderstorm-900: #18323b;
  --color-raging-thunderstorm-950: #081e25;
}

SCSS

$raging-thunderstorm: #004b5f;
$raging-thunderstorm-rgb: 0, 75, 95;
$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);
}