#001248

CSS

:root {
  --storm: #001248;
  --storm-rgb: 0 18 72;
  --storm-oklch: oklch(0.215 0.104 262.5);
}

.element {
  color: var(--storm);
  background-color: hsl(225 100% 14%);
  border-color: oklch(0.215 0.104 262.5);
}

Tailwind CSS v4

@theme {
  --color-storm: #001248;
  --color-storm-50: #e6f6ff;
  --color-storm-100: #d7e8ff;
  --color-storm-200: #bed4ff;
  --color-storm-300: #9db7ed;
  --color-storm-400: #7d9edc;
  --color-storm-500: #6085cb;
  --color-storm-600: #5271ab;
  --color-storm-700: #415a89;
  --color-storm-800: #2d4266;
  --color-storm-900: #1e2e48;
  --color-storm-950: #0e1a2f;
}

SCSS

$storm: #001248;
$storm-rgb: 0, 18, 72;
$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);
}