#9B99A4

CSS

:root {
  --lavender-ash: #9b99a4;
  --lavender-ash-rgb: 155 153 164;
  --lavender-ash-oklch: oklch(0.688 0.016 294.3);
}

.element {
  color: var(--lavender-ash);
  background-color: hsl(251 6% 62%);
  border-color: oklch(0.688 0.016 294.3);
}

Tailwind CSS v4

@theme {
  --color-lavender-ash: #9b99a4;
  --color-lavender-ash-50: #f5f4f9;
  --color-lavender-ash-100: #e8e7ed;
  --color-lavender-ash-200: #d5d3da;
  --color-lavender-ash-300: #b8b6bf;
  --color-lavender-ash-400: #9f9da7;
  --color-lavender-ash-500: #868490;
  --color-lavender-ash-600: #72707a;
  --color-lavender-ash-700: #5b5a62;
  --color-lavender-ash-800: #424148;
  --color-lavender-ash-900: #2e2d32;
  --color-lavender-ash-950: #1b1a1e;
}

SCSS

$lavender-ash: #9b99a4;
$lavender-ash-rgb: 155, 153, 164;
$lavender-ash-light: mix(#fff, $lavender-ash, 20%);
$lavender-ash-dark: mix(#000, $lavender-ash, 20%);

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