#3E747A

CSS

:root {
  --ocean-slumber: #3e747a;
  --ocean-slumber-rgb: 62 116 122;
  --ocean-slumber-oklch: oklch(0.524 0.058 204.9);
}

.element {
  color: var(--ocean-slumber);
  background-color: hsl(186 33% 36%);
  border-color: oklch(0.524 0.058 204.9);
}

Tailwind CSS v4

@theme {
  --color-ocean-slumber: #3e747a;
  --color-ocean-slumber-50: #e3fafe;
  --color-ocean-slumber-100: #d3eef2;
  --color-ocean-slumber-200: #b9dce1;
  --color-ocean-slumber-300: #95c0c6;
  --color-ocean-slumber-400: #75a9af;
  --color-ocean-slumber-500: #559298;
  --color-ocean-slumber-600: #487b81;
  --color-ocean-slumber-700: #3a6367;
  --color-ocean-slumber-800: #29484b;
  --color-ocean-slumber-900: #1b3234;
  --color-ocean-slumber-950: #0b1e20;
}

SCSS

$ocean-slumber: #3e747a;
$ocean-slumber-rgb: 62, 116, 122;
$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);
}