#68A1CA

CSS

:root {
  --wandering-river: #68a1ca;
  --wandering-river-rgb: 104 161 202;
  --wandering-river-oklch: oklch(0.686 0.085 240.9);
}

.element {
  color: var(--wandering-river);
  background-color: hsl(205 48% 60%);
  border-color: oklch(0.686 0.085 240.9);
}

Tailwind CSS v4

@theme {
  --color-wandering-river: #68a1ca;
  --color-wandering-river-50: #e1f9ff;
  --color-wandering-river-100: #d0ecff;
  --color-wandering-river-200: #b6d9f6;
  --color-wandering-river-300: #92bde0;
  --color-wandering-river-400: #6fa5cc;
  --color-wandering-river-500: #4e8db9;
  --color-wandering-river-600: #43779c;
  --color-wandering-river-700: #35607e;
  --color-wandering-river-800: #24465d;
  --color-wandering-river-900: #183141;
  --color-wandering-river-950: #081d2a;
}

SCSS

$wandering-river: #68a1ca;
$wandering-river-rgb: 104, 161, 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);
}