#E3F3F5

CSS

:root {
  --winter-s-breath: #e3f3f5;
  --winter-s-breath-rgb: 227 243 245;
  --winter-s-breath-oklch: oklch(0.953 0.017 205.8);
}

.element {
  color: var(--winter-s-breath);
  background-color: hsl(187 47% 93%);
  border-color: oklch(0.953 0.017 205.8);
}

Tailwind CSS v4

@theme {
  --color-winter-s-breath: #e3f3f5;
  --color-winter-s-breath-50: #f0f7f8;
  --color-winter-s-breath-100: #e2eaeb;
  --color-winter-s-breath-200: #ccd6d8;
  --color-winter-s-breath-300: #aebabc;
  --color-winter-s-breath-400: #93a2a3;
  --color-winter-s-breath-500: #7a8a8c;
  --color-winter-s-breath-600: #677476;
  --color-winter-s-breath-700: #525d5f;
  --color-winter-s-breath-800: #3c4445;
  --color-winter-s-breath-900: #292f30;
  --color-winter-s-breath-950: #171c1c;
}

SCSS

$winter-s-breath: #e3f3f5;
$winter-s-breath-rgb: 227, 243, 245;
$winter-s-breath-light: mix(#fff, $winter-s-breath, 20%);
$winter-s-breath-dark: mix(#000, $winter-s-breath, 20%);

.element {
  color: $winter-s-breath;
  box-shadow: 0 0 0 2px rgba($winter-s-breath, 0.35);
}