Blue Marble

CSS

:root {
  --blue-marble: #6594bc;
  --blue-marble-rgb: 101 148 188;
  --blue-marble-oklch: oklch(0.649 0.079 245.1);
}

.element {
  color: var(--blue-marble);
  background-color: hsl(208 39% 57%);
  border-color: oklch(0.649 0.079 245.1);
}

Tailwind CSS v4

@theme {
  --color-blue-marble: #6594bc;
  --color-blue-marble-50: #e4f8ff;
  --color-blue-marble-100: #d4ebff;
  --color-blue-marble-200: #bad8f5;
  --color-blue-marble-300: #97bcde;
  --color-blue-marble-400: #77a4ca;
  --color-blue-marble-500: #588cb7;
  --color-blue-marble-600: #4b769b;
  --color-blue-marble-700: #3b5f7c;
  --color-blue-marble-800: #29465c;
  --color-blue-marble-900: #1c3040;
  --color-blue-marble-950: #0c1c29;
}

SCSS

$blue-marble: #6594bc;
$blue-marble-rgb: 101, 148, 188;
$blue-marble-light: mix(#fff, $blue-marble, 20%);
$blue-marble-dark: mix(#000, $blue-marble, 20%);

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