#DCE9E7

CSS

:root {
  --second-wind: #dce9e7;
  --second-wind-rgb: 220 233 231;
  --second-wind-oklch: oklch(0.924 0.014 185.9);
}

.element {
  color: var(--second-wind);
  background-color: hsl(171 23% 89%);
  border-color: oklch(0.924 0.014 185.9);
}

Tailwind CSS v4

@theme {
  --color-second-wind: #dce9e7;
  --color-second-wind-50: #f1f6f6;
  --color-second-wind-100: #e3e9e9;
  --color-second-wind-200: #ced6d5;
  --color-second-wind-300: #b0bab9;
  --color-second-wind-400: #96a19f;
  --color-second-wind-500: #7c8987;
  --color-second-wind-600: #697473;
  --color-second-wind-700: #545d5c;
  --color-second-wind-800: #3d4443;
  --color-second-wind-900: #2a2f2e;
  --color-second-wind-950: #181c1b;
}

SCSS

$second-wind: #dce9e7;
$second-wind-rgb: 220, 233, 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);
}