#D3E3E7

CSS

:root {
  --valley-of-tears: #d3e3e7;
  --valley-of-tears-rgb: 211 227 231;
  --valley-of-tears-oklch: oklch(0.905 0.018 214.4);
}

.element {
  color: var(--valley-of-tears);
  background-color: hsl(192 29% 87%);
  border-color: oklch(0.905 0.018 214.4);
}

Tailwind CSS v4

@theme {
  --color-valley-of-tears: #d3e3e7;
  --color-valley-of-tears-50: #f0f6f8;
  --color-valley-of-tears-100: #e2e9ec;
  --color-valley-of-tears-200: #ccd6d9;
  --color-valley-of-tears-300: #aebabd;
  --color-valley-of-tears-400: #93a1a5;
  --color-valley-of-tears-500: #79898e;
  --color-valley-of-tears-600: #677478;
  --color-valley-of-tears-700: #525d60;
  --color-valley-of-tears-800: #3c4446;
  --color-valley-of-tears-900: #292f30;
  --color-valley-of-tears-950: #171c1d;
}

SCSS

$valley-of-tears: #d3e3e7;
$valley-of-tears-rgb: 211, 227, 231;
$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);
}