#E3EEEA

CSS

:root {
  --second-wind: #e3eeea;
  --second-wind-rgb: 227 238 234;
  --second-wind-oklch: oklch(0.94 0.013 172.4);
}

.element {
  color: var(--second-wind);
  background-color: hsl(158 24% 91%);
  border-color: oklch(0.94 0.013 172.4);
}

Tailwind CSS v4

@theme {
  --color-second-wind: #e3eeea;
  --color-second-wind-50: #f2f6f5;
  --color-second-wind-100: #e4e9e7;
  --color-second-wind-200: #cfd6d4;
  --color-second-wind-300: #b1bab7;
  --color-second-wind-400: #97a19d;
  --color-second-wind-500: #7e8985;
  --color-second-wind-600: #6b7471;
  --color-second-wind-700: #555d5a;
  --color-second-wind-800: #3e4442;
  --color-second-wind-900: #2b2f2d;
  --color-second-wind-950: #181b1a;
}

SCSS

$second-wind: #e3eeea;
$second-wind-rgb: 227, 238, 234;
$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);
}