In the Deep End

CSS

:root {
  --in-the-deep-end: #91a8a8;
  --in-the-deep-end-rgb: 145 168 168;
  --in-the-deep-end-oklch: oklch(0.714 0.026 196.6);
}

.element {
  color: var(--in-the-deep-end);
  background-color: hsl(180 12% 61%);
  border-color: oklch(0.714 0.026 196.6);
}

Tailwind CSS v4

@theme {
  --color-in-the-deep-end: #91a8a8;
  --color-in-the-deep-end-50: #edf7f8;
  --color-in-the-deep-end-100: #dfebeb;
  --color-in-the-deep-end-200: #c8d8d8;
  --color-in-the-deep-end-300: #a9bcbc;
  --color-in-the-deep-end-400: #8ea3a3;
  --color-in-the-deep-end-500: #738c8c;
  --color-in-the-deep-end-600: #627676;
  --color-in-the-deep-end-700: #4e5f5f;
  --color-in-the-deep-end-800: #384545;
  --color-in-the-deep-end-900: #273030;
  --color-in-the-deep-end-950: #151c1c;
}

SCSS

$in-the-deep-end: #91a8a8;
$in-the-deep-end-rgb: 145, 168, 168;
$in-the-deep-end-light: mix(#fff, $in-the-deep-end, 20%);
$in-the-deep-end-dark: mix(#000, $in-the-deep-end, 20%);

.element {
  color: $in-the-deep-end;
  box-shadow: 0 0 0 2px rgba($in-the-deep-end, 0.35);
}