#71A0C2

CSS

:root {
  --wandering-river: #71a0c2;
  --wandering-river-rgb: 113 160 194;
  --wandering-river-oklch: oklch(0.685 0.071 240.5);
}

.element {
  color: var(--wandering-river);
  background-color: hsl(205 40% 60%);
  border-color: oklch(0.685 0.071 240.5);
}

Tailwind CSS v4

@theme {
  --color-wandering-river: #71a0c2;
  --color-wandering-river-50: #e4f8ff;
  --color-wandering-river-100: #d4ebfe;
  --color-wandering-river-200: #bbd9f1;
  --color-wandering-river-300: #98bcd9;
  --color-wandering-river-400: #78a4c5;
  --color-wandering-river-500: #598cb1;
  --color-wandering-river-600: #4c7796;
  --color-wandering-river-700: #3c5f78;
  --color-wandering-river-800: #2a4658;
  --color-wandering-river-900: #1c303e;
  --color-wandering-river-950: #0c1d27;
}

SCSS

$wandering-river: #71a0c2;
$wandering-river-rgb: 113, 160, 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);
}