#2F59AA

CSS

:root {
  --blasphemous-blue: #2f59aa;
  --blasphemous-blue-rgb: 47 89 170;
  --blasphemous-blue-oklch: oklch(0.479 0.138 262);
}

.element {
  color: var(--blasphemous-blue);
  background-color: hsl(220 57% 43%);
  border-color: oklch(0.479 0.138 262);
}

Tailwind CSS v4

@theme {
  --color-blasphemous-blue: #2f59aa;
  --color-blasphemous-blue-50: #e1f6ff;
  --color-blasphemous-blue-100: #d1e8ff;
  --color-blasphemous-blue-200: #b6d4ff;
  --color-blasphemous-blue-300: #93b7ff;
  --color-blasphemous-blue-400: #719df0;
  --color-blasphemous-blue-500: #5183e1;
  --color-blasphemous-blue-600: #456fbe;
  --color-blasphemous-blue-700: #375998;
  --color-blasphemous-blue-800: #244172;
  --color-blasphemous-blue-900: #182d50;
  --color-blasphemous-blue-950: #091a35;
}

SCSS

$blasphemous-blue: #2f59aa;
$blasphemous-blue-rgb: 47, 89, 170;
$blasphemous-blue-light: mix(#fff, $blasphemous-blue, 20%);
$blasphemous-blue-dark: mix(#000, $blasphemous-blue, 20%);

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