Watercolour Sky

CSS

:root {
  --watercolour-sky: #b9d9e7;
  --watercolour-sky-rgb: 185 217 231;
  --watercolour-sky-oklch: oklch(0.866 0.039 226.1);
}

.element {
  color: var(--watercolour-sky);
  background-color: hsl(198 49% 82%);
  border-color: oklch(0.866 0.039 226.1);
}

Tailwind CSS v4

@theme {
  --color-watercolour-sky: #b9d9e7;
  --color-watercolour-sky-50: #eaf8fe;
  --color-watercolour-sky-100: #dbebf2;
  --color-watercolour-sky-200: #c4d8e2;
  --color-watercolour-sky-300: #a4bcc7;
  --color-watercolour-sky-400: #87a4b0;
  --color-watercolour-sky-500: #6b8c9a;
  --color-watercolour-sky-600: #5b7682;
  --color-watercolour-sky-700: #485f68;
  --color-watercolour-sky-800: #34464d;
  --color-watercolour-sky-900: #233035;
  --color-watercolour-sky-950: #121c20;
}

SCSS

$watercolour-sky: #b9d9e7;
$watercolour-sky-rgb: 185, 217, 231;
$watercolour-sky-light: mix(#fff, $watercolour-sky, 20%);
$watercolour-sky-dark: mix(#000, $watercolour-sky, 20%);

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