Blue Sash

CSS

:root {
  --blue-sash: #494d58;
  --blue-sash-rgb: 73 77 88;
  --blue-sash-oklch: oklch(0.421 0.019 269.7);
}

.element {
  color: var(--blue-sash);
  background-color: hsl(224 9% 32%);
  border-color: oklch(0.421 0.019 269.7);
}

Tailwind CSS v4

@theme {
  --color-blue-sash: #494d58;
  --color-blue-sash-50: #f3f5fb;
  --color-blue-sash-100: #e5e8ee;
  --color-blue-sash-200: #d1d4dd;
  --color-blue-sash-300: #b4b7c1;
  --color-blue-sash-400: #9a9eaa;
  --color-blue-sash-500: #818693;
  --color-blue-sash-600: #6d717d;
  --color-blue-sash-700: #575b64;
  --color-blue-sash-800: #3f4249;
  --color-blue-sash-900: #2c2e33;
  --color-blue-sash-950: #191b1e;
}

SCSS

$blue-sash: #494d58;
$blue-sash-rgb: 73, 77, 88;
$blue-sash-light: mix(#fff, $blue-sash, 20%);
$blue-sash-dark: mix(#000, $blue-sash, 20%);

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