#5BA2D1

CSS

:root {
  --sub-zero: #5ba2d1;
  --sub-zero-rgb: 91 162 209;
  --sub-zero-oklch: oklch(0.685 0.1 239.5);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(204 56% 59%);
  border-color: oklch(0.685 0.1 239.5);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #5ba2d1;
  --color-sub-zero-50: #ddfaff;
  --color-sub-zero-100: #cbedff;
  --color-sub-zero-200: #afdafc;
  --color-sub-zero-300: #89bee6;
  --color-sub-zero-400: #64a7d3;
  --color-sub-zero-500: #3d8ec1;
  --color-sub-zero-600: #3578a3;
  --color-sub-zero-700: #2a6083;
  --color-sub-zero-800: #1b4761;
  --color-sub-zero-900: #123144;
  --color-sub-zero-950: #041d2c;
}

SCSS

$sub-zero: #5ba2d1;
$sub-zero-rgb: 91, 162, 209;
$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);
}