#5158B1

CSS

:root {
  --blasphemous-blue: #5158b1;
  --blasphemous-blue-rgb: 81 88 177;
  --blasphemous-blue-oklch: oklch(0.501 0.139 276.7);
}

.element {
  color: var(--blasphemous-blue);
  background-color: hsl(236 38% 51%);
  border-color: oklch(0.501 0.139 276.7);
}

Tailwind CSS v4

@theme {
  --color-blasphemous-blue: #5158b1;
  --color-blasphemous-blue-50: #ecf2ff;
  --color-blasphemous-blue-100: #dde4ff;
  --color-blasphemous-blue-200: #c7cfff;
  --color-blasphemous-blue-300: #a8b0fe;
  --color-blasphemous-blue-400: #8a96f0;
  --color-blasphemous-blue-500: #707ae0;
  --color-blasphemous-blue-600: #5f68bd;
  --color-blasphemous-blue-700: #4c5398;
  --color-blasphemous-blue-800: #353d72;
  --color-blasphemous-blue-900: #242a50;
  --color-blasphemous-blue-950: #131736;
}

SCSS

$blasphemous-blue: #5158b1;
$blasphemous-blue-rgb: 81, 88, 177;
$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);
}