#001346

CSS

:root {
  --storm: #001346;
  --storm-rgb: 0 19 70;
  --storm-oklch: oklch(0.215 0.099 262);
}

.element {
  color: var(--storm);
  background-color: hsl(224 100% 14%);
  border-color: oklch(0.215 0.099 262);
}

Tailwind CSS v4

@theme {
  --color-storm: #001346;
  --color-storm-50: #e7f6ff;
  --color-storm-100: #d7e8ff;
  --color-storm-200: #bfd5ff;
  --color-storm-300: #9eb7eb;
  --color-storm-400: #7e9fda;
  --color-storm-500: #6185c8;
  --color-storm-600: #5371a9;
  --color-storm-700: #425a88;
  --color-storm-800: #2e4265;
  --color-storm-900: #1f2e47;
  --color-storm-950: #0f1a2e;
}

SCSS

$storm: #001346;
$storm-rgb: 0, 19, 70;
$storm-light: mix(#fff, $storm, 20%);
$storm-dark: mix(#000, $storm, 20%);

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