#656D79

CSS

:root {
  --ashen-whisper: #656d79;
  --ashen-whisper-rgb: 101 109 121;
  --ashen-whisper-oklch: oklch(0.532 0.021 258.4);
}

.element {
  color: var(--ashen-whisper);
  background-color: hsl(216 9% 44%);
  border-color: oklch(0.532 0.021 258.4);
}

Tailwind CSS v4

@theme {
  --color-ashen-whisper: #656d79;
  --color-ashen-whisper-50: #f2f5fb;
  --color-ashen-whisper-100: #e4e8ef;
  --color-ashen-whisper-200: #cfd5de;
  --color-ashen-whisper-300: #b1b8c3;
  --color-ashen-whisper-400: #979fab;
  --color-ashen-whisper-500: #7e8795;
  --color-ashen-whisper-600: #6a727e;
  --color-ashen-whisper-700: #555b65;
  --color-ashen-whisper-800: #3e434a;
  --color-ashen-whisper-900: #2a2e33;
  --color-ashen-whisper-950: #181b1f;
}

SCSS

$ashen-whisper: #656d79;
$ashen-whisper-rgb: 101, 109, 121;
$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);
}