#00694A

CSS

:root {
  --into-the-green: #00694a;
  --into-the-green-rgb: 0 105 74;
  --into-the-green-oklch: oklch(0.461 0.098 164.5);
}

.element {
  color: var(--into-the-green);
  background-color: hsl(162 100% 21%);
  border-color: oklch(0.461 0.098 164.5);
}

Tailwind CSS v4

@theme {
  --color-into-the-green: #00694a;
  --color-into-the-green-50: #dcffef;
  --color-into-the-green-100: #caf3e1;
  --color-into-the-green-200: #ade2cb;
  --color-into-the-green-300: #86c8ac;
  --color-into-the-green-400: #63b190;
  --color-into-the-green-500: #399a75;
  --color-into-the-green-600: #328363;
  --color-into-the-green-700: #28694f;
  --color-into-the-green-800: #1d4d38;
  --color-into-the-green-900: #133526;
  --color-into-the-green-950: #042015;
}

SCSS

$into-the-green: #00694a;
$into-the-green-rgb: 0, 105, 74;
$into-the-green-light: mix(#fff, $into-the-green, 20%);
$into-the-green-dark: mix(#000, $into-the-green, 20%);

.element {
  color: $into-the-green;
  box-shadow: 0 0 0 2px rgba($into-the-green, 0.35);
}