#009DA7

CSS

:root {
  --baltic: #009da7;
  --baltic-rgb: 0 157 167;
  --baltic-oklch: oklch(0.634 0.108 202.8);
}

.element {
  color: var(--baltic);
  background-color: hsl(184 100% 33%);
  border-color: oklch(0.634 0.108 202.8);
}

Tailwind CSS v4

@theme {
  --color-baltic: #009da7;
  --color-baltic-50: #d2ffff;
  --color-baltic-100: #bef3f9;
  --color-baltic-200: #9de2ea;
  --color-baltic-300: #6fc8d1;
  --color-baltic-400: #3cb1ba;
  --color-baltic-500: #009aa5;
  --color-baltic-600: #00828c;
  --color-baltic-700: #006870;
  --color-baltic-800: #004d51;
  --color-baltic-900: #003639;
  --color-baltic-950: #002123;
}

SCSS

$baltic: #009da7;
$baltic-rgb: 0, 157, 167;
$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);
}