#37757B

CSS

:root {
  --ocean-slumber: #37757b;
  --ocean-slumber-rgb: 55 117 123;
  --ocean-slumber-oklch: oklch(0.524 0.064 203.8);
}

.element {
  color: var(--ocean-slumber);
  background-color: hsl(185 38% 35%);
  border-color: oklch(0.524 0.064 203.8);
}

Tailwind CSS v4

@theme {
  --color-ocean-slumber: #37757b;
  --color-ocean-slumber-50: #e1fbfe;
  --color-ocean-slumber-100: #d0eff2;
  --color-ocean-slumber-200: #b5dde2;
  --color-ocean-slumber-300: #91c1c7;
  --color-ocean-slumber-400: #70aab0;
  --color-ocean-slumber-500: #4d939a;
  --color-ocean-slumber-600: #427c82;
  --color-ocean-slumber-700: #356368;
  --color-ocean-slumber-800: #25494c;
  --color-ocean-slumber-900: #193335;
  --color-ocean-slumber-950: #091e20;
}

SCSS

$ocean-slumber: #37757b;
$ocean-slumber-rgb: 55, 117, 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);
}