#63A1CE

CSS

:root {
  --sub-zero: #63a1ce;
  --sub-zero-rgb: 99 161 206;
  --sub-zero-oklch: oklch(0.685 0.093 241.4);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(205 52% 60%);
  border-color: oklch(0.685 0.093 241.4);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #63a1ce;
  --color-sub-zero-50: #dff9ff;
  --color-sub-zero-100: #ceecff;
  --color-sub-zero-200: #b3daf9;
  --color-sub-zero-300: #8ebde4;
  --color-sub-zero-400: #6ba5d0;
  --color-sub-zero-500: #488dbe;
  --color-sub-zero-600: #3e78a0;
  --color-sub-zero-700: #316081;
  --color-sub-zero-800: #21475f;
  --color-sub-zero-900: #163143;
  --color-sub-zero-950: #071d2b;
}

SCSS

$sub-zero: #63a1ce;
$sub-zero-rgb: 99, 161, 206;
$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);
}