#57A3CD

CSS

:root {
  --sub-zero: #57a3cd;
  --sub-zero-rgb: 87 163 205;
  --sub-zero-oklch: oklch(0.684 0.098 234.9);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(201 54% 57%);
  border-color: oklch(0.684 0.098 234.9);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #57a3cd;
  --color-sub-zero-50: #dcfaff;
  --color-sub-zero-100: #caeeff;
  --color-sub-zero-200: #addbf9;
  --color-sub-zero-300: #87bfe3;
  --color-sub-zero-400: #61a8d0;
  --color-sub-zero-500: #3890bd;
  --color-sub-zero-600: #317aa0;
  --color-sub-zero-700: #276180;
  --color-sub-zero-800: #19485f;
  --color-sub-zero-900: #103242;
  --color-sub-zero-950: #031e2b;
}

SCSS

$sub-zero: #57a3cd;
$sub-zero-rgb: 87, 163, 205;
$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);
}