Holbein Blue Grey

CSS

:root {
  --holbein-blue-grey: #547d86;
  --holbein-blue-grey-rgb: 84 125 134;
  --holbein-blue-grey-oklch: oklch(0.563 0.048 212.9);
}

.element {
  color: var(--holbein-blue-grey);
  background-color: hsl(191 23% 43%);
  border-color: oklch(0.563 0.048 212.9);
}

Tailwind CSS v4

@theme {
  --color-holbein-blue-grey: #547d86;
  --color-holbein-blue-grey-50: #e7f9fe;
  --color-holbein-blue-grey-100: #d7ecf2;
  --color-holbein-blue-grey-200: #bedae1;
  --color-holbein-blue-grey-300: #9dbec7;
  --color-holbein-blue-grey-400: #7ea6af;
  --color-holbein-blue-grey-500: #618f99;
  --color-holbein-blue-grey-600: #527981;
  --color-holbein-blue-grey-700: #426168;
  --color-holbein-blue-grey-800: #2f474c;
  --color-holbein-blue-grey-900: #203135;
  --color-holbein-blue-grey-950: #0f1d20;
}

SCSS

$holbein-blue-grey: #547d86;
$holbein-blue-grey-rgb: 84, 125, 134;
$holbein-blue-grey-light: mix(#fff, $holbein-blue-grey, 20%);
$holbein-blue-grey-dark: mix(#000, $holbein-blue-grey, 20%);

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