Blue Sapphire

CSS

:root {
  --blue-sapphire: #126180;
  --blue-sapphire-rgb: 18 97 128;
  --blue-sapphire-oklch: oklch(0.463 0.087 230.6);
}

.element {
  color: var(--blue-sapphire);
  background-color: hsl(197 75% 29%);
  border-color: oklch(0.463 0.087 230.6);
}

Tailwind CSS v4

@theme {
  --color-blue-sapphire: #126180;
  --color-blue-sapphire-50: #defaff;
  --color-blue-sapphire-100: #cceeff;
  --color-blue-sapphire-200: #b0dbf4;
  --color-blue-sapphire-300: #8ac0dd;
  --color-blue-sapphire-400: #66a8c8;
  --color-blue-sapphire-500: #4090b5;
  --color-blue-sapphire-600: #377a99;
  --color-blue-sapphire-700: #2c627a;
  --color-blue-sapphire-800: #1d485a;
  --color-blue-sapphire-900: #13323f;
  --color-blue-sapphire-950: #051e28;
}

SCSS

$blue-sapphire: #126180;
$blue-sapphire-rgb: 18, 97, 128;
$blue-sapphire-light: mix(#fff, $blue-sapphire, 20%);
$blue-sapphire-dark: mix(#000, $blue-sapphire, 20%);

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