#54A3CC

CSS

:root {
  --sub-zero: #54a3cc;
  --sub-zero-rgb: 84 163 204;
  --sub-zero-oklch: oklch(0.682 0.098 233.4);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(201 54% 56%);
  border-color: oklch(0.682 0.098 233.4);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #54a3cc;
  --color-sub-zero-50: #dbfaff;
  --color-sub-zero-100: #c9eeff;
  --color-sub-zero-200: #acdcf9;
  --color-sub-zero-300: #85c0e3;
  --color-sub-zero-400: #5ea8cf;
  --color-sub-zero-500: #3490bd;
  --color-sub-zero-600: #2e7a9f;
  --color-sub-zero-700: #256280;
  --color-sub-zero-800: #17485e;
  --color-sub-zero-900: #0f3242;
  --color-sub-zero-950: #021e2a;
}

SCSS

$sub-zero: #54a3cc;
$sub-zero-rgb: 84, 163, 204;
$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);
}