#6FA0C4

CSS

:root {
  --wandering-river: #6fa0c4;
  --wandering-river-rgb: 111 160 196;
  --wandering-river-oklch: oklch(0.685 0.075 241);
}

.element {
  color: var(--wandering-river);
  background-color: hsl(205 42% 60%);
  border-color: oklch(0.685 0.075 241);
}

Tailwind CSS v4

@theme {
  --color-wandering-river: #6fa0c4;
  --color-wandering-river-50: #e4f8ff;
  --color-wandering-river-100: #d3ebff;
  --color-wandering-river-200: #bad9f2;
  --color-wandering-river-300: #97bddb;
  --color-wandering-river-400: #76a5c7;
  --color-wandering-river-500: #578db3;
  --color-wandering-river-600: #4a7797;
  --color-wandering-river-700: #3b5f79;
  --color-wandering-river-800: #29465a;
  --color-wandering-river-900: #1b303f;
  --color-wandering-river-950: #0b1d28;
}

SCSS

$wandering-river: #6fa0c4;
$wandering-river-rgb: 111, 160, 196;
$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);
}