#011343

CSS

:root {
  --storm: #011343;
  --storm-rgb: 1 19 67;
  --storm-oklch: oklch(0.212 0.094 262.4);
}

.element {
  color: var(--storm);
  background-color: hsl(224 97% 13%);
  border-color: oklch(0.212 0.094 262.4);
}

Tailwind CSS v4

@theme {
  --color-storm: #011343;
  --color-storm-50: #e8f6ff;
  --color-storm-100: #d8e8ff;
  --color-storm-200: #c0d5fe;
  --color-storm-300: #9fb7e9;
  --color-storm-400: #809fd7;
  --color-storm-500: #6485c5;
  --color-storm-600: #5571a6;
  --color-storm-700: #445a85;
  --color-storm-800: #2f4263;
  --color-storm-900: #202e46;
  --color-storm-950: #0f1a2d;
}

SCSS

$storm: #011343;
$storm-rgb: 1, 19, 67;
$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);
}