#67A1C8

CSS

:root {
  --wandering-river: #67a1c8;
  --wandering-river-rgb: 103 161 200;
  --wandering-river-oklch: oklch(0.684 0.084 239.1);
}

.element {
  color: var(--wandering-river);
  background-color: hsl(204 47% 59%);
  border-color: oklch(0.684 0.084 239.1);
}

Tailwind CSS v4

@theme {
  --color-wandering-river: #67a1c8;
  --color-wandering-river-50: #e1f9ff;
  --color-wandering-river-100: #d0ecff;
  --color-wandering-river-200: #b5daf5;
  --color-wandering-river-300: #91bedf;
  --color-wandering-river-400: #6fa6cb;
  --color-wandering-river-500: #4d8eb8;
  --color-wandering-river-600: #42789b;
  --color-wandering-river-700: #34607c;
  --color-wandering-river-800: #24475c;
  --color-wandering-river-900: #183140;
  --color-wandering-river-950: #081d29;
}

SCSS

$wandering-river: #67a1c8;
$wandering-river-rgb: 103, 161, 200;
$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);
}