#7CA1A7

CSS

:root {
  --stormy-waters: #7ca1a7;
  --stormy-waters-rgb: 124 161 167;
  --stormy-waters-oklch: oklch(0.684 0.041 208.5);
}

.element {
  color: var(--stormy-waters);
  background-color: hsl(188 20% 57%);
  border-color: oklch(0.684 0.041 208.5);
}

Tailwind CSS v4

@theme {
  --color-stormy-waters: #7ca1a7;
  --color-stormy-waters-50: #e8f9fc;
  --color-stormy-waters-100: #d9ecf0;
  --color-stormy-waters-200: #c1d9de;
  --color-stormy-waters-300: #a0bec3;
  --color-stormy-waters-400: #83a6ab;
  --color-stormy-waters-500: #668e95;
  --color-stormy-waters-600: #56787e;
  --color-stormy-waters-700: #456065;
  --color-stormy-waters-800: #31474a;
  --color-stormy-waters-900: #223133;
  --color-stormy-waters-950: #111d1f;
}

SCSS

$stormy-waters: #7ca1a7;
$stormy-waters-rgb: 124, 161, 167;
$stormy-waters-light: mix(#fff, $stormy-waters, 20%);
$stormy-waters-dark: mix(#000, $stormy-waters, 20%);

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