#587B7B

CSS

:root {
  --stream-burble: #587b7b;
  --stream-burble-rgb: 88 123 123;
  --stream-burble-oklch: oklch(0.557 0.04 196.1);
}

.element {
  color: var(--stream-burble);
  background-color: hsl(180 17% 41%);
  border-color: oklch(0.557 0.04 196.1);
}

Tailwind CSS v4

@theme {
  --color-stream-burble: #587b7b;
  --color-stream-burble-50: #e9f9f9;
  --color-stream-burble-100: #daeced;
  --color-stream-burble-200: #c2dada;
  --color-stream-burble-300: #a1bebf;
  --color-stream-burble-400: #84a6a6;
  --color-stream-burble-500: #678f8f;
  --color-stream-burble-600: #587979;
  --color-stream-burble-700: #466161;
  --color-stream-burble-800: #324746;
  --color-stream-burble-900: #223131;
  --color-stream-burble-950: #111d1d;
}

SCSS

$stream-burble: #587b7b;
$stream-burble-rgb: 88, 123, 123;
$stream-burble-light: mix(#fff, $stream-burble, 20%);
$stream-burble-dark: mix(#000, $stream-burble, 20%);

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