#78A2A7

CSS

:root {
  --stormy-waters: #78a2a7;
  --stormy-waters-rgb: 120 162 167;
  --stormy-waters-oklch: oklch(0.683 0.046 205.3);
}

.element {
  color: var(--stormy-waters);
  background-color: hsl(186 21% 56%);
  border-color: oklch(0.683 0.046 205.3);
}

Tailwind CSS v4

@theme {
  --color-stormy-waters: #78a2a7;
  --color-stormy-waters-50: #e7f9fc;
  --color-stormy-waters-100: #d7edf0;
  --color-stormy-waters-200: #bfdade;
  --color-stormy-waters-300: #9dbfc3;
  --color-stormy-waters-400: #7fa7ab;
  --color-stormy-waters-500: #618f95;
  --color-stormy-waters-600: #53797e;
  --color-stormy-waters-700: #426165;
  --color-stormy-waters-800: #2f4749;
  --color-stormy-waters-900: #203133;
  --color-stormy-waters-950: #0f1d1f;
}

SCSS

$stormy-waters: #78a2a7;
$stormy-waters-rgb: 120, 162, 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);
}