#63A1CA

CSS

:root {
  --sub-zero: #63a1ca;
  --sub-zero-rgb: 99 161 202;
  --sub-zero-oklch: oklch(0.683 0.088 238.9);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(204 49% 59%);
  border-color: oklch(0.683 0.088 238.9);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #63a1ca;
  --color-sub-zero-50: #e0f9ff;
  --color-sub-zero-100: #cfecff;
  --color-sub-zero-200: #b3daf7;
  --color-sub-zero-300: #8fbee1;
  --color-sub-zero-400: #6ba6cd;
  --color-sub-zero-500: #488eba;
  --color-sub-zero-600: #3e789d;
  --color-sub-zero-700: #31607e;
  --color-sub-zero-800: #21475d;
  --color-sub-zero-900: #163141;
  --color-sub-zero-950: #071d2a;
}

SCSS

$sub-zero: #63a1ca;
$sub-zero-rgb: 99, 161, 202;
$sub-zero-light: mix(#fff, $sub-zero, 20%);
$sub-zero-dark: mix(#000, $sub-zero, 20%);

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