#E0ECE7

CSS

:root {
  --second-wind: #e0ece7;
  --second-wind-rgb: 224 236 231;
  --second-wind-oklch: oklch(0.933 0.014 169.2);
}

.element {
  color: var(--second-wind);
  background-color: hsl(155 24% 90%);
  border-color: oklch(0.933 0.014 169.2);
}

Tailwind CSS v4

@theme {
  --color-second-wind: #e0ece7;
  --color-second-wind-50: #f1f6f4;
  --color-second-wind-100: #e3e9e7;
  --color-second-wind-200: #ced6d3;
  --color-second-wind-300: #b0bab6;
  --color-second-wind-400: #97a19d;
  --color-second-wind-500: #7d8984;
  --color-second-wind-600: #6a7470;
  --color-second-wind-700: #555d5a;
  --color-second-wind-800: #3e4441;
  --color-second-wind-900: #2b2f2d;
  --color-second-wind-950: #181c1a;
}

SCSS

$second-wind: #e0ece7;
$second-wind-rgb: 224, 236, 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);
}