#43737B

CSS

:root {
  --ocean-slumber: #43737b;
  --ocean-slumber-rgb: 67 115 123;
  --ocean-slumber-oklch: oklch(0.525 0.054 209.2);
}

.element {
  color: var(--ocean-slumber);
  background-color: hsl(189 29% 37%);
  border-color: oklch(0.525 0.054 209.2);
}

Tailwind CSS v4

@theme {
  --color-ocean-slumber: #43737b;
  --color-ocean-slumber-50: #e5fafe;
  --color-ocean-slumber-100: #d5edf2;
  --color-ocean-slumber-200: #bbdbe1;
  --color-ocean-slumber-300: #98bfc7;
  --color-ocean-slumber-400: #79a8b0;
  --color-ocean-slumber-500: #5a9099;
  --color-ocean-slumber-600: #4d7a82;
  --color-ocean-slumber-700: #3d6268;
  --color-ocean-slumber-800: #2b484c;
  --color-ocean-slumber-900: #1d3235;
  --color-ocean-slumber-950: #0d1e20;
}

SCSS

$ocean-slumber: #43737b;
$ocean-slumber-rgb: 67, 115, 123;
$ocean-slumber-light: mix(#fff, $ocean-slumber, 20%);
$ocean-slumber-dark: mix(#000, $ocean-slumber, 20%);

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