#75A0BE

CSS

:root {
  --wandering-river: #75a0be;
  --wandering-river-rgb: 117 160 190;
  --wandering-river-oklch: oklch(0.686 0.064 239.3);
}

.element {
  color: var(--wandering-river);
  background-color: hsl(205 36% 60%);
  border-color: oklch(0.686 0.064 239.3);
}

Tailwind CSS v4

@theme {
  --color-wandering-river: #75a0be;
  --color-wandering-river-50: #e6f8ff;
  --color-wandering-river-100: #d6ebfc;
  --color-wandering-river-200: #bdd8ee;
  --color-wandering-river-300: #9bbcd6;
  --color-wandering-river-400: #7ba4c1;
  --color-wandering-river-500: #5d8cad;
  --color-wandering-river-600: #4f7792;
  --color-wandering-river-700: #3f5f75;
  --color-wandering-river-800: #2c4656;
  --color-wandering-river-900: #1e303c;
  --color-wandering-river-950: #0e1c26;
}

SCSS

$wandering-river: #75a0be;
$wandering-river-rgb: 117, 160, 190;
$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);
}