Blue Sou’wester

CSS

:root {
  --blue-sou-wester: #404956;
  --blue-sou-wester-rgb: 64 73 86;
  --blue-sou-wester-oklch: oklch(0.402 0.025 257.5);
}

.element {
  color: var(--blue-sou-wester);
  background-color: hsl(215 15% 29%);
  border-color: oklch(0.402 0.025 257.5);
}

Tailwind CSS v4

@theme {
  --color-blue-sou-wester: #404956;
  --color-blue-sou-wester-50: #f1f5fc;
  --color-blue-sou-wester-100: #e3e8f0;
  --color-blue-sou-wester-200: #ced5df;
  --color-blue-sou-wester-300: #b0b8c4;
  --color-blue-sou-wester-400: #959fad;
  --color-blue-sou-wester-500: #7c8797;
  --color-blue-sou-wester-600: #697280;
  --color-blue-sou-wester-700: #545b66;
  --color-blue-sou-wester-800: #3d434b;
  --color-blue-sou-wester-900: #2a2e34;
  --color-blue-sou-wester-950: #171b20;
}

SCSS

$blue-sou-wester: #404956;
$blue-sou-wester-rgb: 64, 73, 86;
$blue-sou-wester-light: mix(#fff, $blue-sou-wester, 20%);
$blue-sou-wester-dark: mix(#000, $blue-sou-wester, 20%);

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