#666C7B

CSS

:root {
  --ashen-whisper: #666c7b;
  --ashen-whisper-rgb: 102 108 123;
  --ashen-whisper-oklch: oklch(0.531 0.025 268.2);
}

.element {
  color: var(--ashen-whisper);
  background-color: hsl(223 9% 44%);
  border-color: oklch(0.531 0.025 268.2);
}

Tailwind CSS v4

@theme {
  --color-ashen-whisper: #666c7b;
  --color-ashen-whisper-50: #f2f5fc;
  --color-ashen-whisper-100: #e4e8f0;
  --color-ashen-whisper-200: #d0d4df;
  --color-ashen-whisper-300: #b2b7c4;
  --color-ashen-whisper-400: #989eae;
  --color-ashen-whisper-500: #7f8697;
  --color-ashen-whisper-600: #6c7180;
  --color-ashen-whisper-700: #565b66;
  --color-ashen-whisper-800: #3e424b;
  --color-ashen-whisper-900: #2b2e34;
  --color-ashen-whisper-950: #181b20;
}

SCSS

$ashen-whisper: #666c7b;
$ashen-whisper-rgb: 102, 108, 123;
$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);
}