Dark Sapphire

CSS

:root {
  --dark-sapphire: #082567;
  --dark-sapphire-rgb: 8 37 103;
  --dark-sapphire-oklch: oklch(0.293 0.121 263.1);
}

.element {
  color: var(--dark-sapphire);
  background-color: hsl(222 86% 22%);
  border-color: oklch(0.293 0.121 263.1);
}

Tailwind CSS v4

@theme {
  --color-dark-sapphire: #082567;
  --color-dark-sapphire-50: #e4f5ff;
  --color-dark-sapphire-100: #d4e8ff;
  --color-dark-sapphire-200: #bbd4ff;
  --color-dark-sapphire-300: #99b7f6;
  --color-dark-sapphire-400: #789de6;
  --color-dark-sapphire-500: #5b84d6;
  --color-dark-sapphire-600: #4d70b4;
  --color-dark-sapphire-700: #3d5991;
  --color-dark-sapphire-800: #2a426c;
  --color-dark-sapphire-900: #1c2d4c;
  --color-dark-sapphire-950: #0c1a32;
}

SCSS

$dark-sapphire: #082567;
$dark-sapphire-rgb: 8, 37, 103;
$dark-sapphire-light: mix(#fff, $dark-sapphire, 20%);
$dark-sapphire-dark: mix(#000, $dark-sapphire, 20%);

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