#6AA1C2

CSS

:root {
  --wandering-river: #6aa1c2;
  --wandering-river-rgb: 106 161 194;
  --wandering-river-oklch: oklch(0.683 0.076 235.8);
}

.element {
  color: var(--wandering-river);
  background-color: hsl(203 42% 59%);
  border-color: oklch(0.683 0.076 235.8);
}

Tailwind CSS v4

@theme {
  --color-wandering-river: #6aa1c2;
  --color-wandering-river-50: #e2f9ff;
  --color-wandering-river-100: #d1ecff;
  --color-wandering-river-200: #b7daf1;
  --color-wandering-river-300: #93beda;
  --color-wandering-river-400: #72a6c5;
  --color-wandering-river-500: #518eb2;
  --color-wandering-river-600: #457896;
  --color-wandering-river-700: #376078;
  --color-wandering-river-800: #264759;
  --color-wandering-river-900: #19313e;
  --color-wandering-river-950: #0a1d27;
}

SCSS

$wandering-river: #6aa1c2;
$wandering-river-rgb: 106, 161, 194;
$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);
}