#DEE9E6

CSS

:root {
  --homoeopathic-blue: #dee9e6;
  --homoeopathic-blue-rgb: 222 233 230;
  --homoeopathic-blue-oklch: oklch(0.925 0.012 178);
}

.element {
  color: var(--homoeopathic-blue);
  background-color: hsl(164 20% 89%);
  border-color: oklch(0.925 0.012 178);
}

Tailwind CSS v4

@theme {
  --color-homoeopathic-blue: #dee9e6;
  --color-homoeopathic-blue-50: #f2f6f5;
  --color-homoeopathic-blue-100: #e4e9e8;
  --color-homoeopathic-blue-200: #cfd6d4;
  --color-homoeopathic-blue-300: #b1b9b7;
  --color-homoeopathic-blue-400: #97a19e;
  --color-homoeopathic-blue-500: #7e8986;
  --color-homoeopathic-blue-600: #6b7471;
  --color-homoeopathic-blue-700: #555d5b;
  --color-homoeopathic-blue-800: #3e4442;
  --color-homoeopathic-blue-900: #2b2f2e;
  --color-homoeopathic-blue-950: #181b1a;
}

SCSS

$homoeopathic-blue: #dee9e6;
$homoeopathic-blue-rgb: 222, 233, 230;
$homoeopathic-blue-light: mix(#fff, $homoeopathic-blue, 20%);
$homoeopathic-blue-dark: mix(#000, $homoeopathic-blue, 20%);

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