#5F6D7F

CSS

:root {
  --ashen-whisper: #5f6d7f;
  --ashen-whisper-rgb: 95 109 127;
  --ashen-whisper-oklch: oklch(0.53 0.033 254.8);
}

.element {
  color: var(--ashen-whisper);
  background-color: hsl(214 14% 44%);
  border-color: oklch(0.53 0.033 254.8);
}

Tailwind CSS v4

@theme {
  --color-ashen-whisper: #5f6d7f;
  --color-ashen-whisper-50: #eff6ff;
  --color-ashen-whisper-100: #e1e9f3;
  --color-ashen-whisper-200: #cbd5e3;
  --color-ashen-whisper-300: #adb8c9;
  --color-ashen-whisper-400: #92a0b2;
  --color-ashen-whisper-500: #78889c;
  --color-ashen-whisper-600: #657384;
  --color-ashen-whisper-700: #515c6a;
  --color-ashen-whisper-800: #3a434e;
  --color-ashen-whisper-900: #282e36;
  --color-ashen-whisper-950: #161b21;
}

SCSS

$ashen-whisper: #5f6d7f;
$ashen-whisper-rgb: 95, 109, 127;
$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);
}