#5FA3C6

CSS

:root {
  --sub-zero: #5fa3c6;
  --sub-zero-rgb: 95 163 198;
  --sub-zero-oklch: oklch(0.684 0.086 232.4);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(200 47% 57%);
  border-color: oklch(0.684 0.086 232.4);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #5fa3c6;
  --color-sub-zero-50: #defaff;
  --color-sub-zero-100: #cdedff;
  --color-sub-zero-200: #b1dbf4;
  --color-sub-zero-300: #8cbfdd;
  --color-sub-zero-400: #68a8c9;
  --color-sub-zero-500: #4290b6;
  --color-sub-zero-600: #3a7a99;
  --color-sub-zero-700: #2e617b;
  --color-sub-zero-800: #1e485b;
  --color-sub-zero-900: #14323f;
  --color-sub-zero-950: #051e28;
}

SCSS

$sub-zero: #5fa3c6;
$sub-zero-rgb: 95, 163, 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);
}