Post It

CSS

:root {
  --post-it: #0074b4;
  --post-it-rgb: 0 116 180;
  --post-it-oklch: oklch(0.538 0.132 243.7);
}

.element {
  color: var(--post-it);
  background-color: hsl(201 100% 35%);
  border-color: oklch(0.538 0.132 243.7);
}

Tailwind CSS v4

@theme {
  --color-post-it: #0074b4;
  --color-post-it-50: #d7faff;
  --color-post-it-100: #c4edff;
  --color-post-it-200: #a5dbff;
  --color-post-it-300: #7dbef7;
  --color-post-it-400: #51a6e6;
  --color-post-it-500: #188dd6;
  --color-post-it-600: #1a78b5;
  --color-post-it-700: #156091;
  --color-post-it-800: #07476b;
  --color-post-it-900: #05314c;
  --color-post-it-950: #001d32;
}

SCSS

$post-it: #0074b4;
$post-it-rgb: 0, 116, 180;
$post-it-light: mix(#fff, $post-it, 20%);
$post-it-dark: mix(#000, $post-it, 20%);

.element {
  color: $post-it;
  box-shadow: 0 0 0 2px rgba($post-it, 0.35);
}