#4FA3D0

CSS

:root {
  --sub-zero: #4fa3d0;
  --sub-zero-rgb: 79 163 208;
  --sub-zero-oklch: oklch(0.682 0.105 234.6);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(201 58% 56%);
  border-color: oklch(0.682 0.105 234.6);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #4fa3d0;
  --color-sub-zero-50: #dafbff;
  --color-sub-zero-100: #c8eeff;
  --color-sub-zero-200: #aadcfc;
  --color-sub-zero-300: #82c0e6;
  --color-sub-zero-400: #5aa8d3;
  --color-sub-zero-500: #2c90c1;
  --color-sub-zero-600: #287aa3;
  --color-sub-zero-700: #206283;
  --color-sub-zero-800: #124861;
  --color-sub-zero-900: #0c3244;
  --color-sub-zero-950: #001e2c;
}

SCSS

$sub-zero: #4fa3d0;
$sub-zero-rgb: 79, 163, 208;
$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);
}