#DDEAE7

CSS

:root {
  --second-wind: #ddeae7;
  --second-wind-rgb: 221 234 231;
  --second-wind-oklch: oklch(0.926 0.014 180.7);
}

.element {
  color: var(--second-wind);
  background-color: hsl(166 24% 89%);
  border-color: oklch(0.926 0.014 180.7);
}

Tailwind CSS v4

@theme {
  --color-second-wind: #ddeae7;
  --color-second-wind-50: #f1f6f5;
  --color-second-wind-100: #e3e9e8;
  --color-second-wind-200: #ced6d5;
  --color-second-wind-300: #b0bab8;
  --color-second-wind-400: #96a19f;
  --color-second-wind-500: #7c8986;
  --color-second-wind-600: #697472;
  --color-second-wind-700: #545d5b;
  --color-second-wind-800: #3d4442;
  --color-second-wind-900: #2a2f2e;
  --color-second-wind-950: #181c1b;
}

SCSS

$second-wind: #ddeae7;
$second-wind-rgb: 221, 234, 231;
$second-wind-light: mix(#fff, $second-wind, 20%);
$second-wind-dark: mix(#000, $second-wind, 20%);

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