#007183

CSS

:root {
  --teal-with-it: #007183;
  --teal-with-it-rgb: 0 113 131;
  --teal-with-it-oklch: oklch(0.504 0.089 213.7);
}

.element {
  color: var(--teal-with-it);
  background-color: hsl(188 100% 26%);
  border-color: oklch(0.504 0.089 213.7);
}

Tailwind CSS v4

@theme {
  --color-teal-with-it: #007183;
  --color-teal-with-it-50: #dafcff;
  --color-teal-with-it-100: #c8f0fb;
  --color-teal-with-it-200: #aadeec;
  --color-teal-with-it-300: #82c3d4;
  --color-teal-with-it-400: #5aacbe;
  --color-teal-with-it-500: #2a95aa;
  --color-teal-with-it-600: #277e8f;
  --color-teal-with-it-700: #1f6573;
  --color-teal-with-it-800: #134a54;
  --color-teal-with-it-900: #0c343b;
  --color-teal-with-it-950: #011f25;
}

SCSS

$teal-with-it: #007183;
$teal-with-it-rgb: 0, 113, 131;
$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);
}