Atomic

CSS

:root {
  --atomic: #3d4b52;
  --atomic-rgb: 61 75 82;
  --atomic-oklch: oklch(0.403 0.021 229.6);
}

.element {
  color: var(--atomic);
  background-color: hsl(200 15% 28%);
  border-color: oklch(0.403 0.021 229.6);
}

Tailwind CSS v4

@theme {
  --color-atomic: #3d4b52;
  --color-atomic-50: #eff6fa;
  --color-atomic-100: #e1e9ee;
  --color-atomic-200: #ccd6dc;
  --color-atomic-300: #adbac1;
  --color-atomic-400: #92a1a9;
  --color-atomic-500: #788992;
  --color-atomic-600: #66747b;
  --color-atomic-700: #515d63;
  --color-atomic-800: #3b4448;
  --color-atomic-900: #282f32;
  --color-atomic-950: #161c1e;
}

SCSS

$atomic: #3d4b52;
$atomic-rgb: 61, 75, 82;
$atomic-light: mix(#fff, $atomic, 20%);
$atomic-dark: mix(#000, $atomic, 20%);

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