#5CA1D3

CSS

:root {
  --sub-zero: #5ca1d3;
  --sub-zero-rgb: 92 161 211;
  --sub-zero-oklch: oklch(0.684 0.102 241.8);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(205 57% 59%);
  border-color: oklch(0.684 0.102 241.8);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #5ca1d3;
  --color-sub-zero-50: #ddf9ff;
  --color-sub-zero-100: #ccedff;
  --color-sub-zero-200: #b0dafd;
  --color-sub-zero-300: #8abee8;
  --color-sub-zero-400: #65a6d6;
  --color-sub-zero-500: #3f8ec4;
  --color-sub-zero-600: #3778a5;
  --color-sub-zero-700: #2b6085;
  --color-sub-zero-800: #1c4762;
  --color-sub-zero-900: #123145;
  --color-sub-zero-950: #041d2d;
}

SCSS

$sub-zero: #5ca1d3;
$sub-zero-rgb: 92, 161, 211;
$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);
}