#5CA3C7

CSS

:root {
  --sub-zero: #5ca3c7;
  --sub-zero-rgb: 92 163 199;
  --sub-zero-oklch: oklch(0.683 0.089 232.2);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(200 49% 57%);
  border-color: oklch(0.683 0.089 232.2);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #5ca3c7;
  --color-sub-zero-50: #ddfaff;
  --color-sub-zero-100: #cceeff;
  --color-sub-zero-200: #b0dbf5;
  --color-sub-zero-300: #8ac0de;
  --color-sub-zero-400: #65a8ca;
  --color-sub-zero-500: #3f90b7;
  --color-sub-zero-600: #377a9b;
  --color-sub-zero-700: #2b627c;
  --color-sub-zero-800: #1c485b;
  --color-sub-zero-900: #133240;
  --color-sub-zero-950: #041e29;
}

SCSS

$sub-zero: #5ca3c7;
$sub-zero-rgb: 92, 163, 199;
$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);
}