#4EA2D8

CSS

:root {
  --sub-zero: #4ea2d8;
  --sub-zero-rgb: 78 162 216;
  --sub-zero-oklch: oklch(0.683 0.114 239.6);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(203 64% 58%);
  border-color: oklch(0.683 0.114 239.6);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #4ea2d8;
  --color-sub-zero-50: #d9faff;
  --color-sub-zero-100: #c7eeff;
  --color-sub-zero-200: #a9dbff;
  --color-sub-zero-300: #82bfed;
  --color-sub-zero-400: #59a7db;
  --color-sub-zero-500: #2a8fc9;
  --color-sub-zero-600: #2679aa;
  --color-sub-zero-700: #1f6188;
  --color-sub-zero-800: #114765;
  --color-sub-zero-900: #0b3147;
  --color-sub-zero-950: #001d2e;
}

SCSS

$sub-zero: #4ea2d8;
$sub-zero-rgb: 78, 162, 216;
$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);
}