#5DA3C9

CSS

:root {
  --sub-zero: #5da3c9;
  --sub-zero-rgb: 93 163 201;
  --sub-zero-oklch: oklch(0.684 0.09 234);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(201 50% 58%);
  border-color: oklch(0.684 0.09 234);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #5da3c9;
  --color-sub-zero-50: #defaff;
  --color-sub-zero-100: #ccedff;
  --color-sub-zero-200: #b0dbf6;
  --color-sub-zero-300: #8abfe0;
  --color-sub-zero-400: #66a8cc;
  --color-sub-zero-500: #4090b9;
  --color-sub-zero-600: #377a9c;
  --color-sub-zero-700: #2c617d;
  --color-sub-zero-800: #1d485c;
  --color-sub-zero-900: #133241;
  --color-sub-zero-950: #051e29;
}

SCSS

$sub-zero: #5da3c9;
$sub-zero-rgb: 93, 163, 201;
$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);
}