#3C747B

CSS

:root {
  --ocean-slumber: #3c747b;
  --ocean-slumber-rgb: 60 116 123;
  --ocean-slumber-oklch: oklch(0.524 0.06 206.1);
}

.element {
  color: var(--ocean-slumber);
  background-color: hsl(187 34% 36%);
  border-color: oklch(0.524 0.06 206.1);
}

Tailwind CSS v4

@theme {
  --color-ocean-slumber: #3c747b;
  --color-ocean-slumber-50: #e2fafe;
  --color-ocean-slumber-100: #d2eef2;
  --color-ocean-slumber-200: #b8dce2;
  --color-ocean-slumber-300: #94c1c7;
  --color-ocean-slumber-400: #74a9b0;
  --color-ocean-slumber-500: #53929a;
  --color-ocean-slumber-600: #477b82;
  --color-ocean-slumber-700: #386368;
  --color-ocean-slumber-800: #28494c;
  --color-ocean-slumber-900: #1b3235;
  --color-ocean-slumber-950: #0b1e20;
}

SCSS

$ocean-slumber: #3c747b;
$ocean-slumber-rgb: 60, 116, 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);
}