#34757D

CSS

:root {
  --ocean-slumber: #34757d;
  --ocean-slumber-rgb: 52 117 125;
  --ocean-slumber-oklch: oklch(0.524 0.067 206.2);
}

.element {
  color: var(--ocean-slumber);
  background-color: hsl(187 41% 35%);
  border-color: oklch(0.524 0.067 206.2);
}

Tailwind CSS v4

@theme {
  --color-ocean-slumber: #34757d;
  --color-ocean-slumber-50: #e0fbff;
  --color-ocean-slumber-100: #cfeff4;
  --color-ocean-slumber-200: #b4dde3;
  --color-ocean-slumber-300: #8fc1c9;
  --color-ocean-slumber-400: #6eaab2;
  --color-ocean-slumber-500: #4a939c;
  --color-ocean-slumber-600: #407c84;
  --color-ocean-slumber-700: #33646a;
  --color-ocean-slumber-800: #23494d;
  --color-ocean-slumber-900: #183336;
  --color-ocean-slumber-950: #081e21;
}

SCSS

$ocean-slumber: #34757d;
$ocean-slumber-rgb: 52, 117, 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);
}