Blithe Blue

CSS

:root {
  --blithe-blue: #90bdbd;
  --blithe-blue-rgb: 144 189 189;
  --blithe-blue-oklch: oklch(0.766 0.048 196.2);
}

.element {
  color: var(--blithe-blue);
  background-color: hsl(180 25% 65%);
  border-color: oklch(0.766 0.048 196.2);
}

Tailwind CSS v4

@theme {
  --color-blithe-blue: #90bdbd;
  --color-blithe-blue-50: #e6fafa;
  --color-blithe-blue-100: #d7edee;
  --color-blithe-blue-200: #bedbdc;
  --color-blithe-blue-300: #9cbfc0;
  --color-blithe-blue-400: #7ea8a8;
  --color-blithe-blue-500: #609091;
  --color-blithe-blue-600: #517a7a;
  --color-blithe-blue-700: #416262;
  --color-blithe-blue-800: #2e4847;
  --color-blithe-blue-900: #1f3231;
  --color-blithe-blue-950: #0f1e1d;
}

SCSS

$blithe-blue: #90bdbd;
$blithe-blue-rgb: 144, 189, 189;
$blithe-blue-light: mix(#fff, $blithe-blue, 20%);
$blithe-blue-dark: mix(#000, $blithe-blue, 20%);

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