#007181

CSS

:root {
  --teal-with-it: #007181;
  --teal-with-it-rgb: 0 113 129;
  --teal-with-it-oklch: oklch(0.503 0.088 211.7);
}

.element {
  color: var(--teal-with-it);
  background-color: hsl(187 100% 25%);
  border-color: oklch(0.503 0.088 211.7);
}

Tailwind CSS v4

@theme {
  --color-teal-with-it: #007181;
  --color-teal-with-it-50: #dafcff;
  --color-teal-with-it-100: #c8f0fa;
  --color-teal-with-it-200: #aadfeb;
  --color-teal-with-it-300: #82c4d3;
  --color-teal-with-it-400: #5aacbc;
  --color-teal-with-it-500: #2a95a8;
  --color-teal-with-it-600: #277e8e;
  --color-teal-with-it-700: #1f6572;
  --color-teal-with-it-800: #144b53;
  --color-teal-with-it-900: #0d343a;
  --color-teal-with-it-950: #011f24;
}

SCSS

$teal-with-it: #007181;
$teal-with-it-rgb: 0, 113, 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);
}