#65A1CE

CSS

:root {
  --sub-zero: #65a1ce;
  --sub-zero-rgb: 101 161 206;
  --sub-zero-oklch: oklch(0.686 0.091 242.2);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(206 52% 60%);
  border-color: oklch(0.686 0.091 242.2);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #65a1ce;
  --color-sub-zero-50: #e0f9ff;
  --color-sub-zero-100: #cfecff;
  --color-sub-zero-200: #b4d9f9;
  --color-sub-zero-300: #90bde3;
  --color-sub-zero-400: #6da5d0;
  --color-sub-zero-500: #4a8dbe;
  --color-sub-zero-600: #3f77a0;
  --color-sub-zero-700: #326080;
  --color-sub-zero-800: #22465f;
  --color-sub-zero-900: #163142;
  --color-sub-zero-950: #071d2b;
}

SCSS

$sub-zero: #65a1ce;
$sub-zero-rgb: 101, 161, 206;
$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);
}