Laid-Back Blue

CSS

:root {
  --laid-back-blue: #819ea1;
  --laid-back-blue-rgb: 129 158 161;
  --laid-back-blue-oklch: oklch(0.678 0.033 204.2);
}

.element {
  color: var(--laid-back-blue);
  background-color: hsl(186 15% 57%);
  border-color: oklch(0.678 0.033 204.2);
}

Tailwind CSS v4

@theme {
  --color-laid-back-blue: #819ea1;
  --color-laid-back-blue-50: #ebf8fa;
  --color-laid-back-blue-100: #dcebed;
  --color-laid-back-blue-200: #c5d9db;
  --color-laid-back-blue-300: #a5bdc0;
  --color-laid-back-blue-400: #89a4a7;
  --color-laid-back-blue-500: #6d8d90;
  --color-laid-back-blue-600: #5d777a;
  --color-laid-back-blue-700: #4a5f62;
  --color-laid-back-blue-800: #354647;
  --color-laid-back-blue-900: #243031;
  --color-laid-back-blue-950: #131d1d;
}

SCSS

$laid-back-blue: #819ea1;
$laid-back-blue-rgb: 129, 158, 161;
$laid-back-blue-light: mix(#fff, $laid-back-blue, 20%);
$laid-back-blue-dark: mix(#000, $laid-back-blue, 20%);

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