#71A0C6

CSS

:root {
  --wandering-river: #71a0c6;
  --wandering-river-rgb: 113 160 198;
  --wandering-river-oklch: oklch(0.687 0.076 243.6);
}

.element {
  color: var(--wandering-river);
  background-color: hsl(207 43% 61%);
  border-color: oklch(0.687 0.076 243.6);
}

Tailwind CSS v4

@theme {
  --color-wandering-river: #71a0c6;
  --color-wandering-river-50: #e4f8ff;
  --color-wandering-river-100: #d4ebff;
  --color-wandering-river-200: #bad8f3;
  --color-wandering-river-300: #98bcdc;
  --color-wandering-river-400: #77a4c8;
  --color-wandering-river-500: #588cb5;
  --color-wandering-river-600: #4b7699;
  --color-wandering-river-700: #3c5f7a;
  --color-wandering-river-800: #2a465a;
  --color-wandering-river-900: #1c303f;
  --color-wandering-river-950: #0c1c28;
}

SCSS

$wandering-river: #71a0c6;
$wandering-river-rgb: 113, 160, 198;
$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);
}