#457474

CSS

:root {
  --tropical-rain: #457474;
  --tropical-rain-rgb: 69 116 116;
  --tropical-rain-oklch: oklch(0.526 0.051 195.7);
}

.element {
  color: var(--tropical-rain);
  background-color: hsl(180 25% 36%);
  border-color: oklch(0.526 0.051 195.7);
}

Tailwind CSS v4

@theme {
  --color-tropical-rain: #457474;
  --color-tropical-rain-50: #e5fafa;
  --color-tropical-rain-100: #d5eeee;
  --color-tropical-rain-200: #bcdbdc;
  --color-tropical-rain-300: #99c0c1;
  --color-tropical-rain-400: #7ba8a8;
  --color-tropical-rain-500: #5c9191;
  --color-tropical-rain-600: #4e7b7b;
  --color-tropical-rain-700: #3e6262;
  --color-tropical-rain-800: #2d4847;
  --color-tropical-rain-900: #1e3231;
  --color-tropical-rain-950: #0e1e1d;
}

SCSS

$tropical-rain: #457474;
$tropical-rain-rgb: 69, 116, 116;
$tropical-rain-light: mix(#fff, $tropical-rain, 20%);
$tropical-rain-dark: mix(#000, $tropical-rain, 20%);

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