#E9F0F6

CSS

:root {
  --morning-mist: #e9f0f6;
  --morning-mist-rgb: 233 240 246;
  --morning-mist-oklch: oklch(0.952 0.011 243.7);
}

.element {
  color: var(--morning-mist);
  background-color: hsl(208 42% 94%);
  border-color: oklch(0.952 0.011 243.7);
}

Tailwind CSS v4

@theme {
  --color-morning-mist: #e9f0f6;
  --color-morning-mist-50: #f3f5f8;
  --color-morning-mist-100: #e5e8eb;
  --color-morning-mist-200: #d0d5d9;
  --color-morning-mist-300: #b3b8bd;
  --color-morning-mist-400: #999fa5;
  --color-morning-mist-500: #80878d;
  --color-morning-mist-600: #6d7277;
  --color-morning-mist-700: #575b5f;
  --color-morning-mist-800: #3f4346;
  --color-morning-mist-900: #2b2e30;
  --color-morning-mist-950: #191b1d;
}

SCSS

$morning-mist: #e9f0f6;
$morning-mist-rgb: 233, 240, 246;
$morning-mist-light: mix(#fff, $morning-mist, 20%);
$morning-mist-dark: mix(#000, $morning-mist, 20%);

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