Blue Hill

CSS

:root {
  --blue-hill: #1e454d;
  --blue-hill-rgb: 30 69 77;
  --blue-hill-oklch: oklch(0.366 0.046 212.9);
}

.element {
  color: var(--blue-hill);
  background-color: hsl(190 44% 21%);
  border-color: oklch(0.366 0.046 212.9);
}

Tailwind CSS v4

@theme {
  --color-blue-hill: #1e454d;
  --color-blue-hill-50: #e7f9fd;
  --color-blue-hill-100: #d8ecf1;
  --color-blue-hill-200: #bfdae1;
  --color-blue-hill-300: #9ebec6;
  --color-blue-hill-400: #80a6af;
  --color-blue-hill-500: #628f98;
  --color-blue-hill-600: #537981;
  --color-blue-hill-700: #436167;
  --color-blue-hill-800: #2f474b;
  --color-blue-hill-900: #203134;
  --color-blue-hill-950: #101d20;
}

SCSS

$blue-hill: #1e454d;
$blue-hill-rgb: 30, 69, 77;
$blue-hill-light: mix(#fff, $blue-hill, 20%);
$blue-hill-dark: mix(#000, $blue-hill, 20%);

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