#A6D1F3

CSS

:root {
  --andromeda-blue: #a6d1f3;
  --andromeda-blue-rgb: 166 209 243;
  --andromeda-blue-oklch: oklch(0.842 0.066 242.4);
}

.element {
  color: var(--andromeda-blue);
  background-color: hsl(206 76% 80%);
  border-color: oklch(0.842 0.066 242.4);
}

Tailwind CSS v4

@theme {
  --color-andromeda-blue: #a6d1f3;
  --color-andromeda-blue-50: #e6f8ff;
  --color-andromeda-blue-100: #d6ebfd;
  --color-andromeda-blue-200: #bdd8ef;
  --color-andromeda-blue-300: #9cbcd7;
  --color-andromeda-blue-400: #7ca4c3;
  --color-andromeda-blue-500: #5e8cae;
  --color-andromeda-blue-600: #507693;
  --color-andromeda-blue-700: #405f76;
  --color-andromeda-blue-800: #2d4657;
  --color-andromeda-blue-900: #1e303d;
  --color-andromeda-blue-950: #0e1c26;
}

SCSS

$andromeda-blue: #a6d1f3;
$andromeda-blue-rgb: 166, 209, 243;
$andromeda-blue-light: mix(#fff, $andromeda-blue, 20%);
$andromeda-blue-dark: mix(#000, $andromeda-blue, 20%);

.element {
  color: $andromeda-blue;
  box-shadow: 0 0 0 2px rgba($andromeda-blue, 0.35);
}