#666C7A

CSS

:root {
  --ashen-whisper: #666c7a;
  --ashen-whisper-rgb: 102 108 122;
  --ashen-whisper-oklch: oklch(0.531 0.023 267.1);
}

.element {
  color: var(--ashen-whisper);
  background-color: hsl(222 9% 44%);
  border-color: oklch(0.531 0.023 267.1);
}

Tailwind CSS v4

@theme {
  --color-ashen-whisper: #666c7a;
  --color-ashen-whisper-50: #f2f5fc;
  --color-ashen-whisper-100: #e5e8f0;
  --color-ashen-whisper-200: #d0d4de;
  --color-ashen-whisper-300: #b2b7c4;
  --color-ashen-whisper-400: #989ead;
  --color-ashen-whisper-500: #7f8696;
  --color-ashen-whisper-600: #6c717f;
  --color-ashen-whisper-700: #565b66;
  --color-ashen-whisper-800: #3e424b;
  --color-ashen-whisper-900: #2b2e34;
  --color-ashen-whisper-950: #181b1f;
}

SCSS

$ashen-whisper: #666c7a;
$ashen-whisper-rgb: 102, 108, 122;
$ashen-whisper-light: mix(#fff, $ashen-whisper, 20%);
$ashen-whisper-dark: mix(#000, $ashen-whisper, 20%);

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