#70A0C4

CSS

:root {
  --wandering-river: #70a0c4;
  --wandering-river-rgb: 112 160 196;
  --wandering-river-oklch: oklch(0.685 0.074 241.6);
}

.element {
  color: var(--wandering-river);
  background-color: hsl(206 42% 60%);
  border-color: oklch(0.685 0.074 241.6);
}

Tailwind CSS v4

@theme {
  --color-wandering-river: #70a0c4;
  --color-wandering-river-50: #e4f8ff;
  --color-wandering-river-100: #d4ebff;
  --color-wandering-river-200: #bad9f2;
  --color-wandering-river-300: #97bcdb;
  --color-wandering-river-400: #77a4c7;
  --color-wandering-river-500: #588cb3;
  --color-wandering-river-600: #4b7797;
  --color-wandering-river-700: #3b5f79;
  --color-wandering-river-800: #294659;
  --color-wandering-river-900: #1c303f;
  --color-wandering-river-950: #0c1d28;
}

SCSS

$wandering-river: #70a0c4;
$wandering-river-rgb: 112, 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);
}