#D6E8EA

CSS

:root {
  --valley-of-tears: #d6e8ea;
  --valley-of-tears-rgb: 214 232 234;
  --valley-of-tears-oklch: oklch(0.918 0.019 204.8);
}

.element {
  color: var(--valley-of-tears);
  background-color: hsl(186 32% 88%);
  border-color: oklch(0.918 0.019 204.8);
}

Tailwind CSS v4

@theme {
  --color-valley-of-tears: #d6e8ea;
  --color-valley-of-tears-50: #eff7f8;
  --color-valley-of-tears-100: #e1eaeb;
  --color-valley-of-tears-200: #cbd7d8;
  --color-valley-of-tears-300: #adbabc;
  --color-valley-of-tears-400: #92a2a4;
  --color-valley-of-tears-500: #788a8c;
  --color-valley-of-tears-600: #667577;
  --color-valley-of-tears-700: #515d5f;
  --color-valley-of-tears-800: #3b4445;
  --color-valley-of-tears-900: #282f30;
  --color-valley-of-tears-950: #161c1c;
}

SCSS

$valley-of-tears: #d6e8ea;
$valley-of-tears-rgb: 214, 232, 234;
$valley-of-tears-light: mix(#fff, $valley-of-tears, 20%);
$valley-of-tears-dark: mix(#000, $valley-of-tears, 20%);

.element {
  color: $valley-of-tears;
  box-shadow: 0 0 0 2px rgba($valley-of-tears, 0.35);
}