#1F581F

CSS

:root {
  --mysterious-mixture: #1f581f;
  --mysterious-mixture-rgb: 31 88 31;
  --mysterious-mixture-oklch: oklch(0.409 0.107 143.3);
}

.element {
  color: var(--mysterious-mixture);
  background-color: hsl(120 48% 23%);
  border-color: oklch(0.409 0.107 143.3);
}

Tailwind CSS v4

@theme {
  --color-mysterious-mixture: #1f581f;
  --color-mysterious-mixture-50: #e3fee3;
  --color-mysterious-mixture-100: #d2f2d3;
  --color-mysterious-mixture-200: #b8e1b9;
  --color-mysterious-mixture-300: #95c696;
  --color-mysterious-mixture-400: #78af75;
  --color-mysterious-mixture-500: #589856;
  --color-mysterious-mixture-600: #4b8149;
  --color-mysterious-mixture-700: #3c673a;
  --color-mysterious-mixture-800: #2c4b28;
  --color-mysterious-mixture-900: #1e341b;
  --color-mysterious-mixture-950: #0e200b;
}

SCSS

$mysterious-mixture: #1f581f;
$mysterious-mixture-rgb: 31, 88, 31;
$mysterious-mixture-light: mix(#fff, $mysterious-mixture, 20%);
$mysterious-mixture-dark: mix(#000, $mysterious-mixture, 20%);

.element {
  color: $mysterious-mixture;
  box-shadow: 0 0 0 2px rgba($mysterious-mixture, 0.35);
}