#59A2CF

CSS

:root {
  --sub-zero: #59a2cf;
  --sub-zero-rgb: 89 162 207;
  --sub-zero-oklch: oklch(0.683 0.099 237.7);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(203 55% 58%);
  border-color: oklch(0.683 0.099 237.7);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #59a2cf;
  --color-sub-zero-50: #ddfaff;
  --color-sub-zero-100: #cbedff;
  --color-sub-zero-200: #aedbfb;
  --color-sub-zero-300: #88bfe5;
  --color-sub-zero-400: #62a7d2;
  --color-sub-zero-500: #3b8fc0;
  --color-sub-zero-600: #3379a2;
  --color-sub-zero-700: #296182;
  --color-sub-zero-800: #1a4760;
  --color-sub-zero-900: #113143;
  --color-sub-zero-950: #031d2b;
}

SCSS

$sub-zero: #59a2cf;
$sub-zero-rgb: 89, 162, 207;
$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);
}