#40747D

CSS

:root {
  --ocean-slumber: #40747d;
  --ocean-slumber-rgb: 64 116 125;
  --ocean-slumber-oklch: oklch(0.526 0.057 209.9);
}

.element {
  color: var(--ocean-slumber);
  background-color: hsl(189 32% 37%);
  border-color: oklch(0.526 0.057 209.9);
}

Tailwind CSS v4

@theme {
  --color-ocean-slumber: #40747d;
  --color-ocean-slumber-50: #e3faff;
  --color-ocean-slumber-100: #d3edf3;
  --color-ocean-slumber-200: #b9dbe3;
  --color-ocean-slumber-300: #96c0c8;
  --color-ocean-slumber-400: #76a8b1;
  --color-ocean-slumber-500: #56919b;
  --color-ocean-slumber-600: #4a7b83;
  --color-ocean-slumber-700: #3b6269;
  --color-ocean-slumber-800: #29484d;
  --color-ocean-slumber-900: #1c3235;
  --color-ocean-slumber-950: #0c1e20;
}

SCSS

$ocean-slumber: #40747d;
$ocean-slumber-rgb: 64, 116, 125;
$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);
}