#19866B

CSS

:root {
  --shadows-of-time: #19866b;
  --shadows-of-time-rgb: 25 134 107;
  --shadows-of-time-oklch: oklch(0.555 0.102 171);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(165 69% 31%);
  border-color: oklch(0.555 0.102 171);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #19866b;
  --color-shadows-of-time-50: #d9fff2;
  --color-shadows-of-time-100: #c6f4e5;
  --color-shadows-of-time-200: #a7e3d0;
  --color-shadows-of-time-300: #7ec9b2;
  --color-shadows-of-time-400: #57b296;
  --color-shadows-of-time-500: #239c7d;
  --color-shadows-of-time-600: #21846a;
  --color-shadows-of-time-700: #1b6955;
  --color-shadows-of-time-800: #134e3c;
  --color-shadows-of-time-900: #0c3629;
  --color-shadows-of-time-950: #002117;
}

SCSS

$shadows-of-time: #19866b;
$shadows-of-time-rgb: 25, 134, 107;
$shadows-of-time-light: mix(#fff, $shadows-of-time, 20%);
$shadows-of-time-dark: mix(#000, $shadows-of-time, 20%);

.element {
  color: $shadows-of-time;
  box-shadow: 0 0 0 2px rgba($shadows-of-time, 0.35);
}