#1FA8B1

CSS

:root {
  --baltic: #1fa8b1;
  --baltic-rgb: 31 168 177;
  --baltic-oklch: oklch(0.668 0.108 202);
}

.element {
  color: var(--baltic);
  background-color: hsl(184 70% 41%);
  border-color: oklch(0.668 0.108 202);
}

Tailwind CSS v4

@theme {
  --color-baltic: #1fa8b1;
  --color-baltic-50: #d2ffff;
  --color-baltic-100: #bef3f8;
  --color-baltic-200: #9ce2e9;
  --color-baltic-300: #6fc8d1;
  --color-baltic-400: #3bb1ba;
  --color-baltic-500: #009aa5;
  --color-baltic-600: #00838b;
  --color-baltic-700: #00696f;
  --color-baltic-800: #004d51;
  --color-baltic-900: #003638;
  --color-baltic-950: #002123;
}

SCSS

$baltic: #1fa8b1;
$baltic-rgb: 31, 168, 177;
$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);
}