#5BA2D0

CSS

:root {
  --sub-zero: #5ba2d0;
  --sub-zero-rgb: 91 162 208;
  --sub-zero-oklch: oklch(0.684 0.099 238.9);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(204 55% 59%);
  border-color: oklch(0.684 0.099 238.9);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #5ba2d0;
  --color-sub-zero-50: #ddfaff;
  --color-sub-zero-100: #cbedff;
  --color-sub-zero-200: #afdafb;
  --color-sub-zero-300: #89bee6;
  --color-sub-zero-400: #64a7d2;
  --color-sub-zero-500: #3d8fc0;
  --color-sub-zero-600: #3579a2;
  --color-sub-zero-700: #2a6182;
  --color-sub-zero-800: #1b4760;
  --color-sub-zero-900: #123143;
  --color-sub-zero-950: #041d2b;
}

SCSS

$sub-zero: #5ba2d0;
$sub-zero-rgb: 91, 162, 208;
$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);
}