#9B99A6

CSS

:root {
  --lavender-ash: #9b99a6;
  --lavender-ash-rgb: 155 153 166;
  --lavender-ash-oklch: oklch(0.689 0.019 293);
}

.element {
  color: var(--lavender-ash);
  background-color: hsl(249 7% 63%);
  border-color: oklch(0.689 0.019 293);
}

Tailwind CSS v4

@theme {
  --color-lavender-ash: #9b99a6;
  --color-lavender-ash-50: #f5f4fa;
  --color-lavender-ash-100: #e8e7ee;
  --color-lavender-ash-200: #d4d3dc;
  --color-lavender-ash-300: #b8b6c0;
  --color-lavender-ash-400: #9e9da9;
  --color-lavender-ash-500: #868492;
  --color-lavender-ash-600: #72707b;
  --color-lavender-ash-700: #5b5963;
  --color-lavender-ash-800: #424149;
  --color-lavender-ash-900: #2e2d32;
  --color-lavender-ash-950: #1a1a1e;
}

SCSS

$lavender-ash: #9b99a6;
$lavender-ash-rgb: 155, 153, 166;
$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);
}