#E3EDF0

CSS

:root {
  --morning-mist: #e3edf0;
  --morning-mist-rgb: 227 237 240;
  --morning-mist-oklch: oklch(0.939 0.011 217.5);
}

.element {
  color: var(--morning-mist);
  background-color: hsl(194 30% 92%);
  border-color: oklch(0.939 0.011 217.5);
}

Tailwind CSS v4

@theme {
  --color-morning-mist: #e3edf0;
  --color-morning-mist-50: #f2f6f7;
  --color-morning-mist-100: #e4e9ea;
  --color-morning-mist-200: #cfd5d7;
  --color-morning-mist-300: #b1b9bb;
  --color-morning-mist-400: #97a0a3;
  --color-morning-mist-500: #7e888b;
  --color-morning-mist-600: #6b7376;
  --color-morning-mist-700: #555c5e;
  --color-morning-mist-800: #3e4345;
  --color-morning-mist-900: #2b2f30;
  --color-morning-mist-950: #181b1c;
}

SCSS

$morning-mist: #e3edf0;
$morning-mist-rgb: 227, 237, 240;
$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);
}