Little Boy Blue

CSS

:root {
  --little-boy-blue: #6495da;
  --little-boy-blue-rgb: 100 149 218;
  --little-boy-blue-oklch: oklch(0.665 0.116 257.1);
}

.element {
  color: var(--little-boy-blue);
  background-color: hsl(215 61% 62%);
  border-color: oklch(0.665 0.116 257.1);
}

Tailwind CSS v4

@theme {
  --color-little-boy-blue: #6495da;
  --color-little-boy-blue-50: #e2f7ff;
  --color-little-boy-blue-100: #d1eaff;
  --color-little-boy-blue-200: #b7d6ff;
  --color-little-boy-blue-300: #94b9f3;
  --color-little-boy-blue-400: #71a0e2;
  --color-little-boy-blue-500: #5187d2;
  --color-little-boy-blue-600: #4572b1;
  --color-little-boy-blue-700: #375b8e;
  --color-little-boy-blue-800: #25436a;
  --color-little-boy-blue-900: #192f4a;
  --color-little-boy-blue-950: #091b31;
}

SCSS

$little-boy-blue: #6495da;
$little-boy-blue-rgb: 100, 149, 218;
$little-boy-blue-light: mix(#fff, $little-boy-blue, 20%);
$little-boy-blue-dark: mix(#000, $little-boy-blue, 20%);

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