#A5C6E9

CSS

:root {
  --andromeda-blue: #a5c6e9;
  --andromeda-blue-rgb: 165 198 233;
  --andromeda-blue-oklch: oklch(0.814 0.061 250.1);
}

.element {
  color: var(--andromeda-blue);
  background-color: hsl(211 61% 78%);
  border-color: oklch(0.814 0.061 250.1);
}

Tailwind CSS v4

@theme {
  --color-andromeda-blue: #a5c6e9;
  --color-andromeda-blue-50: #e9f7ff;
  --color-andromeda-blue-100: #daeafc;
  --color-andromeda-blue-200: #c2d7ee;
  --color-andromeda-blue-300: #a1bad6;
  --color-andromeda-blue-400: #83a2c2;
  --color-andromeda-blue-500: #678aae;
  --color-andromeda-blue-600: #587493;
  --color-andromeda-blue-700: #465d76;
  --color-andromeda-blue-800: #314457;
  --color-andromeda-blue-900: #222f3d;
  --color-andromeda-blue-950: #111c26;
}

SCSS

$andromeda-blue: #a5c6e9;
$andromeda-blue-rgb: 165, 198, 233;
$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);
}