#64A2C6

CSS

:root {
  --sub-zero: #64a2c6;
  --sub-zero-rgb: 100 162 198;
  --sub-zero-oklch: oklch(0.684 0.083 235.3);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(202 46% 58%);
  border-color: oklch(0.684 0.083 235.3);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #64a2c6;
  --color-sub-zero-50: #e0f9ff;
  --color-sub-zero-100: #cfedff;
  --color-sub-zero-200: #b4daf4;
  --color-sub-zero-300: #8fbedd;
  --color-sub-zero-400: #6ca7c9;
  --color-sub-zero-500: #498fb6;
  --color-sub-zero-600: #3f7999;
  --color-sub-zero-700: #32617b;
  --color-sub-zero-800: #22475b;
  --color-sub-zero-900: #16313f;
  --color-sub-zero-950: #071d28;
}

SCSS

$sub-zero: #64a2c6;
$sub-zero-rgb: 100, 162, 198;
$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);
}