Bird Blue Grey

CSS

:root {
  --bird-blue-grey: #7f92a0;
  --bird-blue-grey-rgb: 127 146 160;
  --bird-blue-grey-oklch: oklch(0.65 0.03 239.9);
}

.element {
  color: var(--bird-blue-grey);
  background-color: hsl(205 15% 56%);
  border-color: oklch(0.65 0.03 239.9);
}

Tailwind CSS v4

@theme {
  --color-bird-blue-grey: #7f92a0;
  --color-bird-blue-grey-50: #eef6fd;
  --color-bird-blue-grey-100: #dfe9f1;
  --color-bird-blue-grey-200: #c9d6e0;
  --color-bird-blue-grey-300: #aabac6;
  --color-bird-blue-grey-400: #8fa1af;
  --color-bird-blue-grey-500: #758999;
  --color-bird-blue-grey-600: #637481;
  --color-bird-blue-grey-700: #4f5d67;
  --color-bird-blue-grey-800: #39444c;
  --color-bird-blue-grey-900: #272f35;
  --color-bird-blue-grey-950: #151c20;
}

SCSS

$bird-blue-grey: #7f92a0;
$bird-blue-grey-rgb: 127, 146, 160;
$bird-blue-grey-light: mix(#fff, $bird-blue-grey, 20%);
$bird-blue-grey-dark: mix(#000, $bird-blue-grey, 20%);

.element {
  color: $bird-blue-grey;
  box-shadow: 0 0 0 2px rgba($bird-blue-grey, 0.35);
}