#686C7A

CSS

:root {
  --ashen-whisper: #686c7a;
  --ashen-whisper-rgb: 104 108 122;
  --ashen-whisper-oklch: oklch(0.533 0.022 273);
}

.element {
  color: var(--ashen-whisper);
  background-color: hsl(227 8% 44%);
  border-color: oklch(0.533 0.022 273);
}

Tailwind CSS v4

@theme {
  --color-ashen-whisper: #686c7a;
  --color-ashen-whisper-50: #f3f5fc;
  --color-ashen-whisper-100: #e5e7f0;
  --color-ashen-whisper-200: #d1d4de;
  --color-ashen-whisper-300: #b4b7c3;
  --color-ashen-whisper-400: #9a9eac;
  --color-ashen-whisper-500: #818696;
  --color-ashen-whisper-600: #6d717e;
  --color-ashen-whisper-700: #575a65;
  --color-ashen-whisper-800: #3f424a;
  --color-ashen-whisper-900: #2c2e34;
  --color-ashen-whisper-950: #191a1f;
}

SCSS

$ashen-whisper: #686c7a;
$ashen-whisper-rgb: 104, 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);
}