In the Nick

CSS

:root {
  --in-the-nick: #2b6daa;
  --in-the-nick-rgb: 43 109 170;
  --in-the-nick-oklch: oklch(0.523 0.117 249.6);
}

.element {
  color: var(--in-the-nick);
  background-color: hsl(209 60% 42%);
  border-color: oklch(0.523 0.117 249.6);
}

Tailwind CSS v4

@theme {
  --color-in-the-nick: #2b6daa;
  --color-in-the-nick-50: #ddf8ff;
  --color-in-the-nick-100: #ccebff;
  --color-in-the-nick-200: #b0d8ff;
  --color-in-the-nick-300: #8bbcf2;
  --color-in-the-nick-400: #66a3e1;
  --color-in-the-nick-500: #418ad0;
  --color-in-the-nick-600: #3875b0;
  --color-in-the-nick-700: #2d5e8d;
  --color-in-the-nick-800: #1c4569;
  --color-in-the-nick-900: #13304a;
  --color-in-the-nick-950: #051c30;
}

SCSS

$in-the-nick: #2b6daa;
$in-the-nick-rgb: 43, 109, 170;
$in-the-nick-light: mix(#fff, $in-the-nick, 20%);
$in-the-nick-dark: mix(#000, $in-the-nick, 20%);

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