#4DA3D6

CSS

:root {
  --sub-zero: #4da3d6;
  --sub-zero-rgb: 77 163 214;
  --sub-zero-oklch: oklch(0.684 0.112 237.6);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(202 63% 57%);
  border-color: oklch(0.684 0.112 237.6);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #4da3d6;
  --color-sub-zero-50: #d9faff;
  --color-sub-zero-100: #c7eeff;
  --color-sub-zero-200: #a9dcff;
  --color-sub-zero-300: #81c0eb;
  --color-sub-zero-400: #58a8d8;
  --color-sub-zero-500: #2890c7;
  --color-sub-zero-600: #257aa8;
  --color-sub-zero-700: #1d6187;
  --color-sub-zero-800: #104863;
  --color-sub-zero-900: #0a3246;
  --color-sub-zero-950: #001d2d;
}

SCSS

$sub-zero: #4da3d6;
$sub-zero-rgb: 77, 163, 214;
$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);
}