#5FA2C8

CSS

:root {
  --sub-zero: #5fa2c8;
  --sub-zero-rgb: 95 162 200;
  --sub-zero-oklch: oklch(0.683 0.088 235);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(202 49% 58%);
  border-color: oklch(0.683 0.088 235);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #5fa2c8;
  --color-sub-zero-50: #defaff;
  --color-sub-zero-100: #cdedff;
  --color-sub-zero-200: #b1dbf6;
  --color-sub-zero-300: #8cbfdf;
  --color-sub-zero-400: #68a7cb;
  --color-sub-zero-500: #438fb8;
  --color-sub-zero-600: #3a799c;
  --color-sub-zero-700: #2e617d;
  --color-sub-zero-800: #1f475c;
  --color-sub-zero-900: #143240;
  --color-sub-zero-950: #051d29;
}

SCSS

$sub-zero: #5fa2c8;
$sub-zero-rgb: 95, 162, 200;
$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);
}