#047381

CSS

:root {
  --teal-with-it: #047381;
  --teal-with-it-rgb: 4 115 129;
  --teal-with-it-oklch: oklch(0.509 0.087 209.6);
}

.element {
  color: var(--teal-with-it);
  background-color: hsl(187 94% 26%);
  border-color: oklch(0.509 0.087 209.6);
}

Tailwind CSS v4

@theme {
  --color-teal-with-it: #047381;
  --color-teal-with-it-50: #dafcff;
  --color-teal-with-it-100: #c8f0f9;
  --color-teal-with-it-200: #aadfea;
  --color-teal-with-it-300: #82c4d1;
  --color-teal-with-it-400: #5aadbb;
  --color-teal-with-it-500: #2a96a6;
  --color-teal-with-it-600: #277f8c;
  --color-teal-with-it-700: #1f6570;
  --color-teal-with-it-800: #144b52;
  --color-teal-with-it-900: #0d3439;
  --color-teal-with-it-950: #011f23;
}

SCSS

$teal-with-it: #047381;
$teal-with-it-rgb: 4, 115, 129;
$teal-with-it-light: mix(#fff, $teal-with-it, 20%);
$teal-with-it-dark: mix(#000, $teal-with-it, 20%);

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