#009FAA

CSS

:root {
  --baltic: #009faa;
  --baltic-rgb: 0 159 170;
  --baltic-oklch: oklch(0.64 0.109 203.5);
}

.element {
  color: var(--baltic);
  background-color: hsl(184 100% 33%);
  border-color: oklch(0.64 0.109 203.5);
}

Tailwind CSS v4

@theme {
  --color-baltic: #009faa;
  --color-baltic-50: #d2ffff;
  --color-baltic-100: #bef3fa;
  --color-baltic-200: #9ce2eb;
  --color-baltic-300: #6ec8d2;
  --color-baltic-400: #3ab1bb;
  --color-baltic-500: #009aa7;
  --color-baltic-600: #00828d;
  --color-baltic-700: #006971;
  --color-baltic-800: #004d52;
  --color-baltic-900: #003639;
  --color-baltic-950: #002124;
}

SCSS

$baltic: #009faa;
$baltic-rgb: 0, 159, 170;
$baltic-light: mix(#fff, $baltic, 20%);
$baltic-dark: mix(#000, $baltic, 20%);

.element {
  color: $baltic;
  box-shadow: 0 0 0 2px rgba($baltic, 0.35);
}