Phthalo Blue

CSS

:root {
  --phthalo-blue: #000f89;
  --phthalo-blue-rgb: 0 15 137;
  --phthalo-blue-oklch: oklch(0.297 0.189 264.2);
}

.element {
  color: var(--phthalo-blue);
  background-color: hsl(233 100% 27%);
  border-color: oklch(0.297 0.189 264.2);
}

Tailwind CSS v4

@theme {
  --color-phthalo-blue: #000f89;
  --color-phthalo-blue-50: #dcf5ff;
  --color-phthalo-blue-100: #cbe7ff;
  --color-phthalo-blue-200: #afd2ff;
  --color-phthalo-blue-300: #8ab3ff;
  --color-phthalo-blue-400: #6498ff;
  --color-phthalo-blue-500: #437bff;
  --color-phthalo-blue-600: #3a69d9;
  --color-phthalo-blue-700: #2e54ae;
  --color-phthalo-blue-800: #1b3e83;
  --color-phthalo-blue-900: #122b5c;
  --color-phthalo-blue-950: #05173f;
}

SCSS

$phthalo-blue: #000f89;
$phthalo-blue-rgb: 0, 15, 137;
$phthalo-blue-light: mix(#fff, $phthalo-blue, 20%);
$phthalo-blue-dark: mix(#000, $phthalo-blue, 20%);

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