#6DA0CA

CSS

:root {
  --wandering-river: #6da0ca;
  --wandering-river-rgb: 109 160 202;
  --wandering-river-oklch: oklch(0.686 0.083 244.3);
}

.element {
  color: var(--wandering-river);
  background-color: hsl(207 47% 61%);
  border-color: oklch(0.686 0.083 244.3);
}

Tailwind CSS v4

@theme {
  --color-wandering-river: #6da0ca;
  --color-wandering-river-50: #e3f8ff;
  --color-wandering-river-100: #d2ebff;
  --color-wandering-river-200: #b8d9f6;
  --color-wandering-river-300: #95bce0;
  --color-wandering-river-400: #74a4cc;
  --color-wandering-river-500: #548cb9;
  --color-wandering-river-600: #48769c;
  --color-wandering-river-700: #395f7d;
  --color-wandering-river-800: #27465d;
  --color-wandering-river-900: #1a3041;
  --color-wandering-river-950: #0a1c2a;
}

SCSS

$wandering-river: #6da0ca;
$wandering-river-rgb: 109, 160, 202;
$wandering-river-light: mix(#fff, $wandering-river, 20%);
$wandering-river-dark: mix(#000, $wandering-river, 20%);

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